GSdx is a great GPU plugin for PCSX2 and PSone Emus. It supports DirectX 9 and DirectX 10.
To use it, you´ll need the newest Direct X Version, update it via the DirectX End-User Runtime Web Installer
All changes there are, as always in the extended text.
Quote:
Changelog:
r1846
Fixed GSDialog so that it doesn´t cause PCSX2 to minimize into the background when closing the config box.
PCSX2: Reloads plugins a little less often.
r1832
Yay, craploads of fixups for the new gui:
* Lots of crashfixes and threading rules compliance (like using wxYield instead of ProcessPendingEvents)
* Killed off some memory corruption
* Better error handling and reporting
* Much speedier suspend/resume during emulation
* Revamped entire savestate system to use a RIFF-style file format (untested, will work on it soon)