Although it's growing increasingly old, Gray Matter's Return to Castle Wolfenstein has been patched once again, to version 1.4. The update is said to improve weapon balance, the multiplayer browser and adds a few in-game options, like auto-reload and a new voting configuration. A number of bugs have also been quashed since the last release.
You can download the new RTCW patch from 3DGamers, who have the full patch (11.5MB) as well as the 1.33-1.4 update (5MB). Linux-based RTCW users (if there are any) will also find the patch waiting for them in various versions tailored to their specific needs.