I thought I'd mention, since it was a question here previously: I just hooked up my Nintendo 64 this past weekend to my Onkyo TX-NR609 receiver. Worked like a charm! When I had previously tried using the composite input on the Optoma, I wouldn't get picture. The projector did not want to recognize the 240p that the N64 outputs.
So, for anyone else hoping to play old school video games, that's one suggestion. I had previously bought a Video Scaler off eBay (the Zinwell Briteview progressive upconverter) but its still in the box (brand new, surprisingly enough). If anybody wants that instead, I'll sell it to you!
~Tighr: Not helping the situation since 1983