OK, so I didn't get around to my book inventory last night. Ended up taking a bath, with a glass of a great local wine we found at the farmers market, & a good book instead.
As far as keeping track of that many books, well, I'm still working out the system for our homeschool books. What we do for our regular books is keep them all on one shelf. Will probably do something similar with the homeschool books, although I need to clear another shelf just for them. I'm also grouping the homeschool ones together by week. The ones we're currently using go on my desk, along with our homeschool texts, and the binder where I keep the girls' various paperwork filed. Upcoming weeks will go on a separate shelf.
For tracking due dates I write the dates on the calendar when we get home from the library. Since I glance at my calendar daily it gives me a quick reminder if anything is coming due. We can also check due dates & renew online (unless it's already overdue...then we need to call to renew). So once I see I have something coming due I check online, renew whatever needs it, and pull whatever needs to go back off the shelf. This system is not perfect since it relies on me actually marking the dates on the calendar though! Also, DH has his own card & doesn't always tell me about due dates. Still, we probably pay $30-40 a year in late fees between the 2 of us, but it's still a deal in our view considering the huge volume of stuff we take out.
Books & audio books can be out for 1 month, DVD 3 days, VHS 1 week. Special materials, like project boxes or bags from the kids room or materials specific for teachers can only be taken for 1 week.
My plan is to return school books to the library as we finish with them. We normally go at least once a week, but I do like to have several weeks of school books ahead of time so I can plan. Also, in case I need to request any. Requests are free for us & can be done online, but always take a LONG time to come in. So if I need something for a history unit 3 weeks from now I need to request it NOW if I want it in time.
Oh, and I'm loving the idea of a rolling suitcase! We have a great ramp & elevator system in our library that the girls always insist on using anyway.