I downloaded sumpfork's code for producing tabs and made some modifications of my own; specifically:
- made some changes and additions to the FAQ text based on rulings Donald X has made on boardgamegeek and dominionstrategy; added other rules from rulebooks (e.g. for Potion, Ruins setup, Shelters setup, etc.)
- removed the description text and split several cards' FAQ text (Possession, Knights, etc.) -- I figure I don't need the tab to know what the card does since the card already has that text, and I'd rather have the FAQ text in its entirety and more readable instead.
- add support for drawing Potion symbols in the card text.
- add support for vertical back offset (which my printer requires to get things to line up)
I'm intending to submit my changes to sumpfork for inclusion, but I'm a little busy right now (although apparently not too busy to be browsing f.ds). If you want a copy of the pdf with these changes, or if you need a tweak or two to get things to line up right, drop me a PM and I'll send you the file.
Also, I strongly recommend printing them double-sided, so that you can make sure your tabs can always alternate left-right. This makes it significantly easier to find the right divider when you want to put cards in/take cards out.
Also also, I didn't post earlier since it sounded like you were set on baseball card boxes, but my storage solution uses one of these boxes:
http://www.sciplus.com/singleItem.cfm/terms/10684. I put Base set in its own box (because if I'm going to a gamer's house, they'll have Base, and if I'm not going to a gamer's house, I don't want to scare people off with my giant case of cards), and I think that case will fit everything else including Guilds, with dividers.