I've noticed a bunch of map files showing up in my solution file. I wasn't really sure what was up until I saw these articles come through. The Magic of the jQuery 1.9 Source Map
Coding Q&A;: CSS Performance, Debugging, Naming Conventions - This is a really good article about CSS performance and it includes a lot of slide decks.
Getting Started With Twitter Bootstrap - I used Twitter Bootstrap for the first time this last weekend. This article came out about three days afterwards and I really could have used it.