If you're looking for collector's editions specifically collectorsedition.org has this feature. You can search for your CE and add it to your collection.
No website I know of does this for regular copies, although there are plenty of programs out there that do this. The best program I have come across is Collectorz (http://www.collectorz.com/game/). A great feature of this software is that you can download the app to your phone and use it to scan the barcodes of the games you own and it will add them to your database.
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