I'm going to keep an online "journal" of sorts (a blog!?) regarding this migration on my site under code -- AJAX migration.  I have a feeling its going to hurt...sooo I figured everyone could live 2nd hand from my pain.  Cheater link is below. http://rileytech.net/coding/ajax.aspx

Asp.net AJAX v1.0 beta available for download now.  TAKE NOTE -- if you have <ATLAS: tags, you will have to change them out to <ASP: tags!!!!!!  So don't just drag, drop, delete! http://www.microsoft.com/downloads/details.aspx?FamilyId=90E0CCDF-D246-4929-A027-D5EE6F806851&displaylang=en