Last played in 2011/Last purchased 2011/First played of 2012: Mario Kart 7
Haven't purchased anything in 2012 yet.

Last game played in 2011: BF3 / SR3
First game played in 2012: Enslaved

Last game bought in 2011: Batman:AC (I think)
First game bought in 2012: Nothing yet, ME3 will be first most likely.

Funnily enough I've gone and upgraded my elite for slim on the 1st of January, so I got the MW3 LE bundle pack as it was the best value - and it was decent looking. So first game/purchase would be MW3, last one of 2011 would have to be Risk.

Last game played in 2011: Uncharted 3 online co-op arena
First game played in 2012: Madden 12 local multiplayer
First game bought in 2012: Don't know yet. Mass Effect 3 or Twisted Metal

Last game bought in 2011 : Dark Souls

First game I will buy in 2012 : FFXIII-2

Last bought in 2011: GTA III: San Andreas and Vice City thanks to the Steam sale
Last played in 2011: Worms Armegeddon with my brothers (Steam sale once again)

I haven't played any games in 2012 yet but I think I'll pop in my copy of Skyward Sword I received for Christmas very soon and I've got plans to buy Rayman Origins this week as my first purchase of the year.

My last game of 2011 was MK7. My first of this year will probably be Resident Evil Revelation next month.

Last bought was Trine 2.
I haven't played anything else since I started Dark souls.
Played it straight through new years (wife sick in bed, sick baby on my lap)

Next game purchase will be a while, I'm taking my time with Dark souls, it is too good to rush through.
I haven't touched Batman yet, only 1 temple into Zelda.
Rayman Origins is probably next unless Ni No Kuni or Kingdoms of Amalur is out by then.

Last game bought 2011: Ace Combat Assault Horizon PS3
Last game played 2011: Final Fantasy Tactics iPhone

First game played 2012: Batman AC
First game bought 2012: GTA 3 10th anniversary edition iPad