So I have it working. Two questions:
I get an error:
[5/20/11 11:03:07 PM] ERROR: Invalid block found on ATI Radeon HD 6490M (#1), possible driver or hardware issue
Ahh, that. That usually indicates the hardware is overheating, damaged, or the driver sucks.
Yeah, that's what I was getting consistently. Hopefully it's just "the driver sucks".