Rocket Commander

David blogged about this in his blog and I just want to reiterate it:

Rocket Commander is a... well... interesting little game that, personally, I found pretty boring as far as gameplay is concerned. However, from a technical-learning-games-programming point of view it is a goldmine of useful information. The game was written by Benjamin Nitschke and is free--with source code.

There's a very informative page on MSDN that has a few tutorials on Rocket Commander. Check it out--they're really, really useful.

Now I just gotta get my hands on Benjamin's book.