Tate Online catalog
Call me a nerd, but I do enjoy a good online catalog design. The Tate catalog has a wonderful way of displaying relevant fragments of its keyword thesaurus along with a search result.
In this example, hovering the pointer over the keyword objects/miscellaneous/cage shows that there are 28 works tagged with that term. Clicking the link brings up a list (with thumbnail images) of those works — including Marcel Duchamp’s Why not sneeze Rose SÚlavy?, presently on display at Tate Modern. Too clever!