Aaron Erickson talked about optimizing LINQ seach through customizing the "Where" clause with the Expression Tree feature of C#3.0. The talk on how i4o worked interesting, but as usual some of the more enlightening bits are revealed through side comments and questions. The audience agreed that LINQ-to-SQL is in it's death throes, to be replaced by, perhaps one day, the Entity Framework. For today, use NHibernate.
Out of sixty people, only two admitted to be VB programmers, everyone else was C#.