Topic: Multiple inventories or saved filters
I'm returning to Magic after not playing since 9th edition. I've got a modest set of cards from 6th-9th, and now I'm starting to build a collection of M15 cards and onward. I'd sort of like to keep them separate on this site, and being able to make multiple inventories would help with that.
Alternatively, it'd be nice if I could save a set of filters. I could make a filter with all of the "old" editions and save it for when I want to look at just the old stuff, and I could keep an up-to-date filter for the stuff I'm actually using to build decks. In the real world I do this with different boxes.