One of my favorite new Tiger features is small, and tucked away somewhat, so it's not widely known:
- Open up Mail, Safari, TextEdit, or just about anything Cocoa (sadly, no Camino though)
- Hold down Command-Control-D (well actually you don't have to keep holding the D, oddly enough)
- Mouse over some words
- Make “ooh” and “aah” noises
You can get the same effect on just one word with the selection context menu item “Look Up in Dictionary”—by default that will open the new Dictionary application, but there's a preference in Dictionary that makes it use the panel instead. I'd have used the much cooler panel as the default myself, but having the preference is enough for me.
Update: Buzz has posted a picture of the dictionary panel, which should be handy for those of my readers too misguided to be able to try this out for themselves.

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