@Jonas: Let's see about a book. A tutorial maybe sometimes, but as of now, Firedrake is really really tiny and nothing special. It's only at the very beginning and I'm not yet in a position to really write about this stuff!
@Uhrwerk: Thanks, I didn't know they used my nickname in Quake3
@Joozey: Nice, I like it. Reminds me a bit of ogame (if you know that game). Do you plan to release it on iOS as well, or just Android?