Well, since I just got back from yet another book sale….. 
Right now I have 4 lists going in Excel: The SCM list, the AO list, the list of books I want that aren’t on those lists, and a master list of all books we own. I have a ton of books, 1200+, and growing all the time (and it’s yard sale and book sale season – yikes!), so this is getting to be a pain… I want my hubby to create a database for me to keep track of it all – he said he could even do one that allows me to use it on my phone, too. He is a programmer, so this is doable for him. 🙂 I know I am lucky….. I have looked at the online ones, but none are what I am looking for. I share books with my mom, as well, and my grandparents have some books I use for school on occasion, so it would be nice to have a space that accomodates different “libraries” in your own little “network,” kwim? LOL
As for organizing them on the shelves…… I haven’t gotten that far yet…..
Many of them are still in boxes after I enter them into my lists. I need to re-organize badly, and hubby needs to build me some more shelves…. 