<p>What book or website would you recommend to learn about QEMU?  I'd like to see some usage examples as well as how to use the APIs.</p>

Best Resources:
Main QEMU Usage Documentation
Qemu Man Page
- Invaluable resource when working with qemu.
Quick Start Guide
- Slightly ubuntu/debian specific. Covers KVM.
Qemu Networking Guide
- Great resource, super useful.
Have fun qemu's a great tool.