Guys.. I m preparing small documetation regarding the Kerberos in Sharepoint and the double hop issues.
Meantime, if you guys have any related issues with Sharepoint Kervberos, feel free to post questions.
We got one while trying to connect to OLAP via custom webpart where we were not able to connect to OLAP cube. Finally we nailed it down and saw another beauty of Kerberos.
Roshan