CoolBoyCorporate posted another helpful Marvel vs. Capcom 3 video. This one runs through how to do OTG combos. If you want to skip straight to the video examples and jump over the explanation, hit the 2 minute mark.

Also, Oreo311 put up a clip showing more ways to punish Akuma's Hurricane Kick, this time in a mirror situation, although these things work with other characters as well.