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A must-have dictionary/thesaurus add-on for Mac users Rated 4 out of 5 stars
An excellent Firefox extension for Mac OS X users -- "Look Up in Dictionary" creates fast and nearly seamless integration between Firefox and the Apple Dictionary App that's built into OS X. Although in some ways it's not quite as robust or universal as, say, David Costanzo's "Dict" Firefox Add-On or the (very powerful but Windows-only) program WordWeb, it's still an essential Firefox extension for modern Mac OSX users, since it offers such clean and fast integration with the operating system's own dictionary/thesaurus app.
Wish-list for future releases: An easy to remember keyboard shortcut (WordWeb's Ctrl-Alt-W and/or Apple's Ctrl-Cmd-D); and the ability to look up words from text-boxes, forms, and search-boxes.