In thinking about it more (on the multibook reading subject), it's not that I can't remember story lines and what's going on with each book and its characters, it's more that I actually get emotionally invested in the book I'm reading and I can't seem to change gears in that way very easily. I have read multiple books at once, mostly in college, but I never seemed to get "into" them to the degree I would if reading them singly. It's an interesting subject, one I hadn't thought a lot about before.

I suppose also I tend to be a systematic type, finishing one thing before I start another. I'm the same way with tasks.