jQuery AutoComplete Plugin - My fork makes it behave more like native implementations in e.g. OS X Mail.app and adds an option, spaceSeparatesItems, if you want space to act like tab/comma.
JavaScript
Pull request Compare This branch is 11 commits ahead of drewwilson:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Failed to load latest commit information.
README.txt
autoSuggest.css
jquery.autoSuggest.js
jquery.autoSuggest.minified.js
jquery.autoSuggest.packed.js

README.txt

AutoSuggest

Copyright 2009-2010 Drew Wilson

http://www.drewwilson.com
http://code.drewwilson.com/entry/autosuggest-jquery-plugin

Version 1.4   -   Updated: Mar. 23, 2010

This Plug-In will auto-complete or auto-suggest completed search queries
for you as you type. You can add multiple selections and remove them on
the fly. It supports keybord navigation (UP + DOWN + RETURN), as well
as multiple AutoSuggest fields on the same page.

Inspied by the Autocomplete plugin by: Jšrn Zaefferer
and the Facelist plugin by: Ian Tearle (iantearle.com)

Contributors:
Alan Hogan (http://alanhogan.com)

This AutoSuggest jQuery plug-in is dual licensed under the MIT and GPL licenses:
http://www.opensource.org/licenses/mit-license.php
http://www.gnu.org/licenses/gpl.html