FYI, a short time ago I started a forum post asking for discussion on the usage of ORM tools:
http://www.sqlservercentral.com/Forums/Topic1087686-391-1.aspx
If you have experience (good or bad) in working with ORM tools with SQL, please post your experience and thoughts there.
Thanks!
Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes