Tagalus is a dictionary of hashtags. Users can contribute definitions, vote on definitions, and decide which best describes the given tag. In addition, you can send a message to @tagalus along with the word "define" followed by a hashtag in order to receive a definition via @reply

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Tool Reviews

Reviewed on December 4, 2009
4

Seems useful to me. I like that it's got OpenID login.

Reviewed on October 21, 2009
4

Quite useful with a clean interface.

Doesn't offer OAuth, but at least OpenID means you don't need to feed it your Twitter password.