Since last year's speech with Vicente (which was in may!), I've been very off from XNA. I have installed XNA GS 2.0 but still haven't played with it :/
But it is never too late, so I'm digging deep into both the new features (networking mostly) and on every interesting post I find related to XNA.
One series of posts I'm following now is about building an XNA Game Engine from scratch, step by step. I find this very useful (in blogs, not in books) as anybody can learn whatever level they have, and if you already know something you can always skip to the next chapter/post.
Right now this are the written posts and their content: