There are a variety of common moldings:

Astragal — semi-circular molding attached to one of a pair of especially fire doors to cover the air gap where the doors meet
Baguette — Thin, half-round molding, smaller than an astragal, sometimes carved, and enriched with foliages, pearls, ribbands, laurels, etc. When enriched with ornaments, it was also called chapelet.[2]
Bandelet — Any little band or flat molding, which crowns a Doric architrave. It is also called a tenia.[2]
Baseboard, "base molding" or "skirting board" — used to conceal the junction of an interior wall and floor, to protect the wall from impacts and to add decorative features. A "speed base" makes use of a base "cap molding" set on top of a plain 1" thick board, however there are hundreds of baseboard profiles.
Baton — see Torus
Batten or board and batten — a symmetrical molding that is placed across a joint where two parallel panels or boards meet
Bead molding — narrow, half-round convex molding, when repeated forms reeding
Beading or bead — molding in the form of a row of half spherical beads, larger than pearling
Other forms: Bead and leaf, bead and reel, bead and spindle
Beak — Small fillet molding left on the edge of a larmier, which forms a canal, and makes a kind of pendant.[2] See also: chin-beak
Bed molding — a narrow molding used at the junction of a wall and ceiling. Bed moldings can be either sprung or plain.
Bolection — a moulding which is raised, projecting proud of the face frame. It is located at the intersection of the different surface levels between the frame and inset panel on a door or wood panel. It will sometimes have a rebate (or rabbet) at the back, the depth of the difference in levels, so that it can lay over the front of both the face frame and the inset panel and can in some instances thus give more space to nail the moulding to the frame, leaving the inset panel free to expand or contract in varying climates, as timber is prone to do.
Cable molding or ropework — Convex molding carved in imitation of a twisted rope or cord, and used for decorative moldings of the Romanesque style in England, France and Spain and adapted for 18th century silver and furniture design (Thomas Sheraton)[3]
Cabled fluting or cable — Convex circular molding sunk in the concave fluting of a classic column, and rising about one-third of the height of the shaft[2]
Casing — Final trim or finished frame around the top, and both sides of a door or window opening
Cartouche (French) escutcheon) — framed panel in the form of a scroll with an inscribed center, or surrounded by compound moldings decorated with floral motifs
Cavetto — (Italian) cavare: "to hollow", concave, quarter-round molding sometimes employed in the place of the cymatium of a cornice, as in the Doric order of the theatre of Marcellus. It forms the crowning feature of the Egyptian temples, and took the place of the cymatium in many of the Etruscan temples.
Chair rail — horizontal molding placed part way up a wall to protect the surface from chair-backs, and used simply as decoration
Chamfer — beveled edge connecting two surfaces
Chin-beak — Concave quarter-round molding. There are few examples of this in ancient buildings, but is common in more recent times.[2]
Corner guard — Used to protect the edge of the wall at an outside corner, or to cover a joint on an inside corner.
Cove molding or Coving — a concave-profile molding that is used at the junction of an interior wall and ceiling
Crown molding — a wide, sprung molding that is used at the junction of an interior wall and ceiling. General term for any molding at the top or "crowning" an architectural element.
Cyma — molding of double curvature, combining the convex ovolo and concave cavetto. When the concave part is uppermost, it is called a cyma recta but if the convex portion is at the top, it is called a cyma reversa, When the crowning molding at the entablature is of the cyma form, it is called a cymatium.
Dentils — Small blocks spaced evenly along the bottom edge of the cornice
Drip cap — this is placed over a door or window opening to prevent water from flowing under the siding or across the glass
Echinus — Similar to the ovolo molding and found beneath the abacus of the Doric capital or decorated with the egg-and-dart pattern below the Ionic capital[3]
Egg-and-dart — One of the most widely used classical moldings[3] with egg shapes alternating with V-shapes and known from Ancient Greek temples (Erechtheion).
Also: Egg and tongue, egg and anchor, egg and star
Fillet — small, flat band separating two surfaces, or between the flutes of a column
Fluting — Vertical, half-round grooves cut into the surface of a column in regular intervals, each separated by a flat astragal. This ornament was used for all but the Tuscan order
Godroon or Gadroon — Ornamental band with the appearance of beading or reeding, especially frequent in silverwork and molding. It comes from the Latin word Guttus, meaning flask. It is said to be derived from raised work on linen, applied in France to varieties of the, bead and reel, in which the bead is often carved with ornament. In England the term is constantly used by auctioneers to describe the raised convex decorations under the bowl of stone or terracotta vases. The godroons radiate from the vertical support of the vase and rise half-way up the bowl.
Also: Gadrooning, lobed decoration, (k)nukked decoration, thumb molding
Guilloche — Interlocking curved bands in a repeating pattern often forming circles enriched with rosettes and found in Assyrian ornament, classical and Renaissance architecure.[3]
Keel molding — with a sharp edge, resembling in cross-section the keel of a ship. It is common in the Early English and Decorated styles.
Ovolo — Simple, convex quarter-round molding that can also be enriched with the egg-and-dart or other pattern
Neck molding
Picture Rail - Functional molding installed 7–9 feet above the floor from which framed pictures and paintings are hung using picture wire and picture rail hooks.
Rosette — Circular, floral decorative element found in Mesopotamian design and early Greek stele. Part of revival styles in architecture since the Renaissance.[3]
Scotia — Concave molding with a lower edge projecting beyond the top and so used at the base of columns as a transition between two torus moldings with different diameters[3]
Screen molding — this is a small molding that is used to hide the area where a screen is attached to the frame.
Shoe molding, toe molding or quarter-round — often used at the bottom of the baseboard to cover a small gap or uneven edge between the flooring and the baseboard.
Torus — Convex, semi-circular molding, larger than an astragal, often at the base of a column, which may be enriched with leaves or plaiting
Trim Molding — A general term used for moldings that are used to create added detail or cover up gaps. They can include corner moldings, cove moldings, rope moldings, quarter rounds, and accent moldings.[4]

http://en.wikipedia.org/wiki/Molding_(decorative)

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