I just wanted to note that today's Counter-Strike: Source update will break srcds_osx. If you're running a CS:S server, please now use the first package labeled
Orange Box/Source 2009/Source 2013 Games. This is the same one that TF2 and DOD:S have required since July.
This version also supports the relatively new Half-Life Deathmatch: Source beta.
Edit: As of September 18, Half-Life 2: Deathmatch also requires the same package.