We have just finished building a *very* detailed whitepaper that explains common issues, patterns, and scenarios for helping to upgrade your existing ASP.NET 1.x applications.  During the beta 2 phase we received a strong amount of feedback the the upgrade wizard needed some significant improvement and we have listened.  Over the past few months the team has done a number of complex DCR's (Design Change Requests) to improve the quality and efficacy of application upgrade.  Even still, not all apps will upgrade 100% and the whitepaper  will help get you the rest of the way -- my expecations is that site upgrades will take half a day to a day at most (that is my goal!)...

Further, to package up all of our related upgrade content today we are announcing the new ASP.NET 1.x --> ASP.NET 2.0 upgrade center which can be found at:

http://msdn.microsoft.com/asp.net/migration/upgrade/default.aspx

and of course the direct link to the brand new upgrade article and best practices:
http://msdn.microsoft.com/asp.net/default.aspx?pull=/library/en-us/dnaspp/html/upgradingaspnet.asp

Let me know here how the upgrades go with the latest CTP's and let me know what you think of the new upgrade article.