The machine had an existing GeForce card in it.  I went and grabbed the latest drivers, installed, rebooted for sanity check.

Shutdown, installed a 5850, started back up with the monitor plugged into the 5850.  Got the latest Catalyst Drivers and Stream SDK, installed, reboot.  I think the Stream SDK is completely optional, but I wanted to play with the clinfo example if something went wrong.

Ran poclbm and it saw both cards.  ATI was 0, Nvidia was 1.  Tried to start poclbm with just -d 0, but it complained about platforms.

Added the --platform=opencl (I think, I forget... there are only two options and they're obvious) with -d 0 and it started mining.

Repeated with -d 1 --platform=cuda and it began mining.

5 minutes later, I think the NVIDIA poclbm instance was just hung.  Ctrl-C, restart and it started working again.  10 or 15 minutes later the ATI instance looked stopped.  Ctrl-C, restart and off it went.  This could possibly have something to do with my workplace network config, PC still being used for work with Visceral Studio, Aero being enabled, etc.

Whole experiment only lasted 30 minutes, but that's all I had for the day.