Thanks to everyone who attended my "Identifying Performance Bottlenecks" session this morning at DevTeach/SQLTeach. As promised, here is the PowerPoint slide deck I used during the presentation.
Regarding the question of on the performance of LINQ, Bob Beauchemin recently posted a series of blogs entries on the topic. Here's a link.
And here's a link to series of posts on the Dynamic Management Views (DMVs) that Louis Davidson authored.