jQuery Tokenize is a plugin which allows your users to select multiple items from a predefined list or ajax, using autocompletion as they type to find each item. You may have seen a similar type of text entry when filling in the recipients field sending messages on facebook or tags on tumblr.
Intuitive UI for selecting multiple items from a large list
Easy to skin / style purely in css, no images required
Supports any backend which can generate JSON, including PHP, Rails, Django, ASP.net
Callbacks when items are added or removed from the list
Select, delete and navigate items using the mouse or keyboard
