I updated my MTC GPU miner.  Those of you who were having issues with invalid shares on the 32-bit build should download the latest version.

In addition, you power users might want to check out the "-s" flag.  It lets you specify the GPU load per hash pass.
It multiplies the work load by 2^X, so "-s 1" does twice the work, "-s 2" does four times the work, and "-s -1" does half the work, etc.


You can check out the thread here: https://bitcointalk.org/index.php?topic=452738.0

Source code:
https://github.com/llamasoft/xptMiner-gpu

Windows binaries:
https://mega.co.nz/#F!Vw5XVKRY!Yf8nyIXGKaSs37NUel_VeA
https://www.dropbox.com/sh/tan8yprhoaq6o1q/BiJYi0JgzU (Dropbox mirror)

Linux users: download the source from github and compile.