You never need to see a page refresh even though the data is from the database.

MochiKit is a highly documented and well tested, suite of JavaScript libraries.

We’ve all gone through the pain of uploading dozens of files, one at a time. Since sites like Facebook have started to popularize multiple file upload and client side image compression, our clients have started to nag for the same features. So we took it upon ourselves to find a couple of similar multiple image [...]

The autocomplete is certainly one of the most seen and used AJAX scripts, however, there are still a few twists and tricks that may be used to spice usability and appearance. Have a look at the following great scripts:

Search Autocomplete - .NET

Yet another AutoComplete

Autocomplete - jQuery

dhtmlxCombo + Autocomplete

AutoComplete - JQuery

AutoSuggest