I don't know if you have read much about the new MCTS qualification, but here at B&D we're getting a few guys through the new course (grats Dom!). I've got the book for the .NET Framework 2.0 course and I'm quite amazed at just how much work is needed to get through it! I've been coding for longer than I care to remember, and doing .NET for many years, but this book just shows how much great stuff there is in .NET 2 that you wouldn't know about unless you knew about, if you know what I mean.

If you haven't been thinking about MCTS yet, I suggest you get your mitts on this book and have a scan through it - it's a great book to read to further your knowledge even if you don't take the exam. And no, I don't believe that you know it all already :)