Useful Ajax Auto Suggest scripts collection
http://woork.blogspot.com/2009/02/useful-ajax-auto-suggest-scripts.html
15 Best Techniques For Implementing Autosuggest With AJAX Into Your Site - TZ
http://www.tutzone.org/2009/06/15-best-techniques-for-implementing.html
AutoSuggest jQuery Plugin | Drewwilson.com
http://code.drewwilson.com/entry/autosuggest-jquery-plugin

AutoSuggest

So I needed to add some auto-completing functionality to my project Build It With Me. I figured it would be easy to find a ready-made jQuery plugin to do the work for me. I was wrong. Naturally I took it upon myself to solve this problem for all of you :) I created this plugin to be as general purpose as possible. As a result it ended up being vastly more customizable than any other jQuery auto-complete plugin. Not only that, I am using actual jQuery. For some reason all the other "jQuery" plugins don't really take advantage of the radness that is jQuery. Consequently, my plugin ended up being dramatically smaller in size (way less code). Just 7kb minified. Have fun with it! AutoSuggest is a very lightweight jQuery plugin that makes auto-completing extremely easy.