I’m currently lost in wikipedia hell when I realized one of the things I find disappointing about the Kindle. I love the inline dictionary, but I really dislike:

• How long it takes to look stuff up
• The quality of the dictionary (not the definitions themselves, but how many words aren’t in the dictionary)
• The fact that the dictionary can’t be used to look up words in a definition.

While all of these are annoying, the last one drives me nuts. I end up looking up words in definitions all the time. Even if I know the word, I might want the exact denotation, a derivation, pronunciation, etymology. Not being able to easily “chain” lookups together is really frustrating.