My vote to cgminer also. Takes a bit more work to start using than the GUI miners for example, but is steadily maintained and developed by an excellent coder (Con Kolivas). Rock solid in best occasions (my best uptime with it was almost an year, had to boot for operating system updates).
The official thread for support and development of cgminer is here:
https://bitcointalk.org/index.php?topic=28402.0Good source for information concerning new versions and so on.