I used to use this all the time back in the jQuery 1.1 days.... then it kinda languished, but now it's back (thanks Remy and Yehuda!). This is a really nice looking, easy to drill into document for jQuery functions:

http://www.visualjquery.com/

If you're drilling down to find what you need, it helps if you know where to look, but if you're not, there's a very fast "filter" at the top that can help. I'd venture to guess it stemmed from this:

http://remysharp.com/jquery-api/

which I remember digging a few months ago. Here's the blog entry for that. It's got an Adobe AIR version, too:

http://remysharp.com/2008/07/04/jquery-api-update-offline-and-anywhere/

Handy stuff. Thanks guys!