Thanks, H - they're fantastic. It's inspiring to see the the 5DmkII has so much potential. I'm thinking the 5DmkII + FS-60CB + Astrotrac + dob will be the perfect portable dark sky imaging/viewing kit for me.
I'm still intoxicated by my really-dark-sky experience on Christmas morning... these are single exposure, straight-out-of-camera shots at ISO 1600, 3200, and 6400 with the Astrotrac roughly pointed at the SCP. Un-freaking-believable.