That's it. I'm just about to start the final Knowledge Review of the whole series (3DBuzz's XNA Xtreme 101).
After Knowledge Review 8 is completed, it's on to Precision, an arcade-style game where... you know what, I'll keep this a secret until I'm actually there. If you really want to know, you'll look for an answer yourself.
Knowledge Review 8 is nowhere as challenging as Knowledge Review 7. But it's still the culmination of everything, not just the near-40 hours of theory.
But what is Knowledge Review 8? Pretty much the "Hello World" of game programming: A Pong-like game.