Beta 2.1 is free for download right now! Grab the final version of TH as soon as possible in the files section!
There is only an update patch, so you will need to have beta 2.0 (also available in the files section) installed! The patch is for servers and clients. A linux built won't be released, because no one would really use it...

Change log:

-spawning without hooks fixed
-no more need to download the spraypaint.wad file
-runes added
-new map th_crossfire
-new map th_country_b1