"We have lots of experts here today ready to talk to you about LINQ to SQL. Just go ahead and start asking any questions about LINQ to SQL, the LINQ syntax or related matters that might be on your mind." by moderator Charlie Calvert MSFT (Moderator)
http://blogs.msdn.com/charlie/archive/2007/05/21/c-linq-to-sql-chat-for-monday-may-21-2007.aspx
I read this chat, and I think it is very useful.