Tokeninput is a jQuery plugin which allows your users to select multiple items from a predefined list, 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.

Full details and documentation can be found on the project page here:

http://loopj.com/jquery-tokeninput/