Just wanted to let you know about another SQL Server resource from Kalen Delaney.
A set of DVDs, where Kalen discusses internals and such. So far, I've looked at the first one, covering meta-data and architecture.
Having known Kalen for some 10 years now (time flies :-) ), I'm not suprised about the high quality of presentation and material.
Check it out at: SQLServerDVD.com.