In case you are like me and are roaming the web looking for great Atlas or Ajax samples - you're in luck - I just stumbled onto this blog entry from the first name that comes to my mind when I think Atlas - Scott Guthrie.
Check out his blog post with a collection of samples from MIX06 conference: http://weblogs.asp.net/scottgu/archive/2006/03/29/441357.aspx
Also if you miss the VS2003 ASP.NET Porject method where you have a solution file with multiple projects and code compiles into a .DLL in your BIN folder - check this out.