If you're looking for a PC time killer, Gamersgate has the popular tower defense/multiplayer online battle arena game Awesomenauts on sale for $3. If you were a little too intimidated to get into games like DotA, LoL or HoN, this is the perfect mix of casual and competitive multiplayer battling that might appeal to you. Awesomenauts scored a 78/100 on Metacritic and the online community continues to grow with constant updates, balance fixes and downloadable content. The game is activated through Steam which gives you access to 50 achievements, leaderboards, controller support and local co-op play. For $3, it's worth taking a flyer on but, if you're still not sure if this is for you, you can check out the trailer here.
The deal is live now but only until midnight tonight. Awesomenauts is normally $9.99 so this is a great time to pick it up if you're interested.
