Raiden IIS - Part B: http://www.newgrounds.com/portal/view/184764
This is an interesting take on Raiden. Your ship is given a shield and you have infinite continues

The following three are movies which crossover Mega Man and Ikaruga. These are freaking awesome. You must watch these!
Megaman Polarity 1: http://www.newgrounds.com/portal/view/107015
Megaman Polarity 2: http://www.newgrounds.com/portal/view/111861
Megaman Polarity 3: http://www.newgrounds.com/portal/view/134782
And this is the playable game based off these movies:
MMPolarity Reconstruction (Game): http://www.newgrounds.com/portal/view/233966