The Shrine

I'm only listing the ones I thought were good, you can find a more complete list here: http://www.1up.com/news/black-friday-vi ... heat-sheet

XBLA

Trials HD - 400 points (Friday only? not up yet)
'Splosion Man - 160 points (Friday only? not up yet)
Monkey Island 1 or 2 - 400 points each
Portal Still Alive - 400 points

PSN
Gundemonium Collection - $7.49 (all 3 games)

Looks like TMNT Re-Shelled is going on sale on Friday too (Trials and Splosion Man are one-day sales then as well) according to Major's Minute.

Steam of course, has insane deals, 90%, 75%, 50% off specials.