You might want to go to this link: http://ajax.asp.net/default.aspx?tabid=47
Install ASP.NET AJAX 1.0 on your machine
- Run the video (highlighted below) and follow along in Visual Studio 2005
- Build a
i. Data grid view
ii. insert/update Data Details View
iii. for a SQL Server table - with no server side code
- AJAX enable the whole thing

Nikhil Kothari's Weblog ASP.NET AJAX: http://www.nikhilk.net/Entry.aspx?id=151
This link has a download for a nice set of cheat sheets:
http://aspnetresources.com/blog/ms_ajax_cheat_sheets_batch2.aspx