Insane deal - if I could go back to when I first played KF2, I would have been happy for paying $50 for it. Especially with all the content they've added over the years.
Not sure if a new thread is worthy yet - but the new Battlefield is being talked about already by EA.
Apparently the largest battlefield dev team to date.
Super easy.
Open Steam
Click the Games tab
Select Add a Non-Steam Game to My Library
Select Browse to find the game
Select the game and open its executable file
Click Add Selected Prog
Done