There are a variety of criteria I use. I try to get my schoolbooks posted quickly because those can be $50 or more each and I want to recoup my money before a new version comes out. I like to work through Amazon vine books because I explicitly asked for them.
Many of the books that are left in the music room are books sent to me by publishers that I'm interested in the topic but hadn't necessarily asked for them. Or books that someone suggested I'd like, and I agree and bought them, but haven't gotten to them yet.
I still have not taken care of the two messes and I only took care of two videos today. Lazy day for me, woke up late and I had a show I like returned with a two hours premiere and I watched a new movie. Now I have a ton of dishes to do and some food before my last two shows starts (will watch the 2:05 and 2:35 replays since i have so much dishes to do...i decided that doing a ton of dishes passed 2:00 would suck).