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Battlefield Bad Company 2 is THE game to get for PC multiplayer gaming right now.  
If you want a single player game that strains your PC's ability to run it try Metro 2033.  
Open world single player game? Get Stalker: Call of Pripyat 
 
RTS? Try to get your hands on Starcraft 2 Beta (pray you get accepted), if not then Dawn of War 2 & its recent expansion "Chaos Rising"

Definitely not at the same time so far, think more devs are just sticking w/ Steam achievements due to its overwhelming market share.

Carne Asada Burritos, from Mission SF or San Diego. I'd kill to have a California Burrito right about now.. mm fries.

Diablo 3, all the mid 20-30 gamers will probably pick this up for nostalgia sake (me included), as well as all the young Blizzard fanboys & WoW addicts since its more of a RPG unlike SC2.

Hilarious Top 10 videos, 3rd one is out finally. (These are from some pub server and not actual matches)
#3:
http://www.youtube.com/watch?v=Zhjicgm8DXA&fmt=22     
 
#2:  
http://www.youtube.com/watch?v=Xj5k32BeKis  
 
#1 (Not in English) 
http://www.youtube.com/watch?v=fSox_5uHdwQ    

This should probably belong on Endgadge but I'm curious what the Giantbomb community think are the better apps? 
 
Plants vs Zombies runs pretty well on this btw lol

Differences: 
360 version releases on the 13th.  
Only runs at Res: 1024x576.

PC version releases on the 27th. 
Contains Ubisoft DRM. Ugh. 
 
Based on your desire to deal with DRM or not and convenience to play with friends for the coop, it's probably the more logical and safer bet to go with the 360 version.

For anyone excited about this game like I am- 
 
As of 4/9/10, Unknown Worlds released a 480mb alpha preview of the engine, official news is here -  http://www.unknownworlds.com/ns2/news/2010/4/ns2_engine_test_released  
< Limited to people who have preordered @  http://www.naturalselection2.com/buy >
 
Bug reporting threads can be found here-  http://getsatisfaction.com/unknownworlds/products/unknownworlds_natural_selection_2

For the music composers, almost always the relevant links can be found off their pages based on their work. Just sift through it and you'll find it or think major titles