A new version of the miner is available; I've updated the download link on the first post, or you can get it here:

    guiminer-20121203.exe (self-extracting archive)

The only change in this release is the fix for this poclbm issue which prevented mining on some cards such as 7970: https://github.com/m0mchil/poclbm/issues/54.
   
Changes:
- Update poclbm to fix poclbm issue with 7970, 6850, and others:
  https://github.com/m0mchil/poclbm/issues/54