There is a new client version available on the download page for lots of operating systems. Changelog:

new: x86: OGR-NG mmx core
new: cellbe: OGR-NG SPU C core
new: cuda: RC5-72 core for nVidia CUDA video cards (#4030)
new: haiku: Added support for Haiku operating system
fix: beos: Fix bug in network code preventing server communication
new: cellbe: OGR-NG SPU ASM core
imp: x86: Identify AMD "Unknown" processors (#4106)
fix: x86: Pentium M naming (#4075)
Make sure you benchmark new cores and select the fastest.