I need a way to capture screenshots of my own gameplay footage from my old Nintendo 64, my Wii, and possibly my Xbox 360 and PlayStation 3. I have quite a bit of experience working with multi-media, but turning my gameplay footage into image and video files I can work with on my computer is something I'm completely new to. I have a vague understanding that I need special hardware and possibly software to pull this off, but I don't know what to purchase, or if I already have many of the things I need here at home. Recording gameplay video footage is something I might need in the future, but right now all I'm concerned with is screenshots of gameplay. Any advice helps. And... obviously any solutions that would work well with a Mac would be preferable.