Hello all.
First let me say that Condition Zero runs quite well on Linux using Cedega, if you go to the Cedega Games Database and click on Counter Strike: Condition Zero link you'll see the pictures I uploaded last year.
http://transgaming.org/gamesdb/games...l?game_id=3356
The OS I was using at the time was Ubuntu Hoary Hedgehog, however I have since installed this game on my Debian Etch system as well.
I have had no slowdowns, lags, or anything else for that fact. As long as your system meets the hardware requirements you should have no problem running this game.
Also as you can see in the pictures the game was running in a windowed environment, this can be changed to full screen. I used Point2Play for all my configuration needs. However if you are using the cvs version of cedega instead of the subscription (I had a subscription) then you can use a free frontend called Grapevine.
http://www.mithunc.net/grapevine/
Peace V