It looks like a really cool site. Would it be useful if you could scan in the UPC of your games with a smart phone?
I was just thinking the other day that it'd be cool to be able to scan games in. I think my data source has UPC data in it, but I don't think it's very well filled out.
Also when you let people scan it it if you can't find a matching game then you let them enter it manually. Eventually you'll at least have the most common games covered.
I went through a similar thought process with a site I made a while ago. grocist.com
Btw. Let me know if I can help out at all. I have a bit of free time lately.