[EXTREMELY IMPORTANT PATCH!!!]: To fix all maps and all fonts go to:
http://thepiratebay.se/torrent/4533019/Counter_Strike_Source_Mega_Fix_(Fonts_Maps)_(HalfLife2_Font_Fix)

[EDIT ] PLEASE APPLY THE FIX TO PLAY THE GAME! If you want to play an offline game, just make sure to play on the supported maps. If you get a run time error the map is BUGGED.

Well, here's the moment you've all been waiting for. 

COUNTER STRIKE: SOURCE

A Cider Port for your Mac.

Just download, unzip, double-click, and play!
It works on most servers, some won't let you join. In some servers voice chat is enabled, in some it isn't.
The text is still garbled, so don't expect to be chatting up your frag buddies online, I say just find a server with voice chat working and stick to it.
Some games may require you to download additional files, just let them download or connect to another server.
This game will run on all Macs, running Mac OS 10.4.8 or higher.
...and yes, it runs on GMA950 integrated graphics.

Happy Fragging

Credits:
Mrberu
Xerxes9000sx

UPDATE:
HERE'S THE FIX TO PLAY THE GAME:
http://thepiratebay.se/torrent/4394071

Oh ye of a little faith! ^.^

[EDIT: To get the resolution to fit your screen, change the resolution settings to "widescreen" then pick the resolution of your choice (e.g. 1280x800 for Macbooks)]