http://kzmod.com/news.php
A mod that is devoted to Half-Life skill map gameplay. It is a true pleasure to play, and I have fallen in love with it after only a few hours.
If you like FF trimp/bhop/conc maps, you're in for a treat (probably). Imagine if FF was nothing but skill maps; that's what Kreedz Climbing is.
Also, if you have played Quake DeFRaG and really liked that -- this is the same concept, only in a different engine with different physics.
I encourage you to give it a go! A small download (1.3GB I believe), and it runs on my machine so it will run on yours, trust me.
Trailer: