I see its been metioned a couple times but.....4WD, diff lock and Bucket curl, Bucket curl, Bucket curl.
Don't be afraid to try stuff like trying to scoop up snow in the bucket. The extra weight when may help you get un-stuck or dropping what you have if its already full. Sometimes just raising the bucket way up will transfer enough weight to the back to get you out. You should be on fairly level ground for that one though.
The bucket curl trick has got me out of a couple frame deep episodes or going to far over the hillside pushing snow and cant back up again /forums/images/graemlins/crazy.gif A HTL(Hydraulic Top link) is really nice as well. Needed that a couple times as well. Sometimes ya just get a little happy doin stuff /forums/images/graemlins/tongue.gif