How to Implement your own Google Suggest Interface
Are you wondering how you might implement your own Google Suggest-style web interface, which automatically populates a listbox based upon characters entered into a text-box? Okay, maybe you're not, but if you happen to be (a) a geek, (b) with nothing to do on Christmas afternoon, and (c) not otherwise engaged, you might have a look at the following.
From the JoelOnSoftware discussion board, Gavi Narra points to his own implementation of a dictionary application with a complete (and nicely done) description of how it was implemented in ASP.NET.
Update: Robert Plank points us to this PHP tutorial: Google Suggest with PHP.