>What is currently available in terms of gigabytes/time at what resolution?
Fred-On the Canon 5D Mark II, it actually depends on the OS. File size is limited to 4 gig, which gives about 12 minutes of 1080P video, or about 24 minutes of 640x480 video (it would appear they don't compress the 640x480 video as much, if one can believe the manual. I haven't shot 24 minutes yet to test). But you can just stop and restart anytime to begin a new file.