An update where you could sort your inventory by quantity would be a huge help

When adding new games I found I can only select NTSC for CD-I games. If I select PAL, the CD-I doesn't show in the consoles list. But it was invented and first released in Europe by Philips, and PAL very much has a different line-up with its own catalogue codes and even country-specific releases.

Please Add Duel Deck: Zendikar vs. Eldrazi (DDP)

You may not hear it enough, thank you, your hard work is paying off and I amongst thousands of others love what this site has become. I come here just about everyday and work on my collection and I also have the Collector Sub. Honestly, I am a bit addicted to the site. ;)  But with that being said I wouldn't have this issue if it wasn't because of all the hard work that your Developer's have put into it. Thank you for giving us a place to log our collections and making it one of the best on the internet. 

Boomer

I can have 3 open pages: 1 for auction listings. 1 for price charting. 1 for Google to verify release date(s).

If Price Charting included release dates right at the top near the items other information I could only need 2 open pages.

Please Add Magic 3rd Edition sets, Thank You

Would be nice to add little Star or whatever, what shows that i have finished the game.

when scanning barcodes or using search, show " In your collection" below results with condition and notes or show it below the returned results instead of just the green icon which doesn't really give a ton of info. 

Allows the quick scanning of items to see if what you are scanning is better than what is in your currently collection.