So today I devoted myself to sorting it out. I set myself to organizing all the massive piles of paper, and two or three bags of shredded paper materials went out to the recycling bin. I broke down all of the shipping boxes so that they could be stored flat until Seanie needs them to mail review units back to the companies that sent them. I weeded out some books, shoved clothes into the closet, and threw away broken pens and empty rolls of tape. Photographs and birthday cards were filed away; if I ever think of something to do with these things, I'll now know where to find them.
It seemed like such a monumental task, but it only took 5-6 hours, which really wasn't that bad, all things considered. I once again have a desk that I can sit at (although the space for legs is completely full of art supplies so there's plenty of work left to be done) with a clear space for writing letters or typing on my laptop.
Seanie's happy because the area looks so much better. I think it's sparked his cleaning bug, though, so more tidying projects will be coming in the near future.