Tagging searching for previous tags, while allowing for new tags to be accepted

I'm looking for a jQuery plug-in that works the way tagging works on Last.fm.

Tagging on Last.fm, uses an autosuggest to find previous tags and recommend them. If you select one of these tags, it updates the CSS like Facebook so it has a bubble around it with an X.

Tags are seperated with a comma: ,

For tags entered that are new a开发者_如何转开发nd not found in the autosuggest, if you type in 'adsadsasd' and then enter a comma, that text is then wrapped in the same style as above on Last.fm.

Anyone know of any plug-ins that will do this in jQuery?

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Here's a nice new jQuery Plugin which will even place an image around each tag and add a remove button.

http://plugins.jquery.com/project/tag-it