Check these out..

ftp://www.detonation.org/pub/muddasheep/hqa_ost/

Note that they are on FTP, so dont panic if your browser takes a while to load the pages (It does for IE)

Try them out. They are really awesome, especially ambiance.

And who says that Austrians can't make music?

(<

(On, and check www.halfquake.com Version 1.1 is out)