1. AJAX Wrapper for Facebook JavaScript
Collin Chung wrote an extension to the FBJS Ajax. This article demonstrates bow to use those new feature.
2. FBJS/Examples/Ajax
The wiki article shows the basic of FBJS Ajax. It demonstrates how to use the different type of Ajax output - Ajax.RAW, Ajax.JSON and Ajax.FBML to update page upon Ajax response.
3. FBJS/Examples/Typeahead/AJAX
This wiki article demonstrates how to use Typeahead feature to provide a classical suggestion field behavior.