Lewis came across a goot tutorial on how to create your own ajax extenders for the standard controls in  the ASP.Net toolkit

http://weblogs.asp.net/dwahlin/archive/2007/08/08/creating-an-asp-net-ajax-toolkit-extender-control.aspx gives a good walkthrough on how to extend the GridView control to disply like an Excel srepadhseet with frozen headers and all that good stuff, well as much good stuff as you can get in Excel

i'm going to run through and extend the GridView as described in the article but maybe it's a moot point now that we have the ListView control in .net 3.5. It does, however, open it up for older sites which need some richer functionality while still using the .net 2 framework

I still enjoy using the Ajax Framework and toolkit alot so it's good that there's still life left in it and they've not dropped it completely yet!!