Accurate sheet music for video games sounds like it would be a tremendous resource for ReMixers, and I wholeheartedly support this. It might be a good idea to collaborate with VGMusic.com on this effort. The accuracy is a little hit and miss with their MIDIs, but it could be a good place to start. Their webmaster Powerlord is member of the OCR forums and would be a great resource.
I'm equally, if not more, interested in sheet music for ReMixes. Transcribing my arrangements has been something I keep intending to do, but I just never seem to get the time. I do get requests occasionally though and I always feel bad that I have nothing except MIDIs to offer. So I'd love to see an official OCR compilation happen, and although I don't have the time to contribute on the labor side, I'd definitely pitch in some funds to compensate people for their time and, if financially and legally feasible, back a Kickstarter for a physical book.
Anyway, here's the thread for the OCR Sheet Music project: http://ocremix.org/community/topic/3373-site-help-ocr-sheet-musictabsmidis/ There are a lot of broken links I need to fix, but hopefully it's a decent starting point.