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[Jive3D]

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[Rickstilwell1]

GCStar is pretty cool because you can upload your own pictures and it will display them on a visual shelf!

[Niku-Sama]

I wish there was something that was able to hook into google goggles API because that way when your out and about you can hit the lebel/box art/text and see if its in your collection or not.

[JSoup]

If you're just looking for mostly static lists with a couple images that can easily be accessed from any online capable device and is free, there are a number of websites.

RFGeneration
VGCollect
Backloggery
Darkadia
Raptr
HowLongToBeat
Dpadd
Grouvee

Probably a few others that I'm not remembering or don't know about.

[Greg2600]

I've compiled a spreadsheet, taken from game lists on Wikipedia and other places. It's in excel, and I keep it on my Google drive so I can access it from my phone while shopping.

[JSoup]

I keep multiple lists, just in case something happens. Always good to be prepared.