Much like the knockouts of 2011, there were a slew of slick submissions to compliment what might have been the most important year in mixed martial arts. We saw slick technical submissions, as well out of nowhere ones that shocked the world. The nominees are:
Yves Edwards vs. Cody McKenzie - UFC Fight Night 23I couldn't find a proper picture of this fight but it was an ironic fight from what I remember. McKenzie was the master of the guillotine choke, but ended up getting choked out himself by the master of thug-jitsu.
Chan Sung Jung vs. Leonard Garcia II- UFC Fight Night Nogueira vs. Davis
Chan Sung Jung beat the bell when he locked on his twister on Leonard Garcia. Literally seconds before the end of the round. He saw an opening an locked it on to even their series of fights at one apiece. 
Jon Jones vs. Lyoto Machida- UFC 140
I haven't seen a standing guillotine since Alistair Overeem's days in Pride. Jones sunk that sucker in their real fast and put the Dragon to sleep. I honestly thought for a few seconds that Jones had killed Machida.
Tito Ortiz vs. Ryan Bader- UFC 132
We finally got to see the grave digger celebration once again when Tito broke his losing streak and possibly picked up the biggest upset of the year. Bader was a heavy favorite and Tito pretty much dominated the entire fight en route to the submission win.
Pablo Garza vs. Yves Jabouin- UFC 129
I don't really remember this fight all that well, but the photo doesn't lie. That is one deep, sick triangle. 
Nate Diaz vs. Takanori Gomi- UFC 135
Nate Diaz went to work on Gomi in their 135 fight. Not only did he light Gomi up on the feet, but he also nearly took his arm off. Nate has been on a roll lately, and it began with this win right here.
TJ Waldburger vs. Mike Stumpf- UFC Fight Night 25
This is another fight I don't really remember, and I couldn't find a video of it during my short search, but that triangle looks hella tight and if that is any indication of what it looked like in live time, then it is no wonder why it was nominated.
Frank Mir vs. Antonio Rodrigo Nogueira II- UFC 140
This was one hell of a fight. Nogueira honestly looked good until the end. I thought he was doing well on his feet, and was fairly close to a finish on the ground. But then Mir turned it around, reversed Nog and broke his arm in the process. Nasty finish by a guy I do not like, but impressive nonetheless. Mir is the only man to ever submit Nog.
Nick Diaz vs. Cyborg Santos - Strikeforce: Diaz vs. Cyborg
Diaz vs. Santos was another absolute war from beginning to end. Cyborg really took it to Diaz, but once Nick grabbed Cyborg's arm he just about ripped it off.
Yves Edwards vs. Cody McKenzie - UFC Fight Night 23