mordo sounds like me - I have read books, but things like non-fiction science books, comparative religion, self-help, etc. For some reason I can't get myself to ever read a novel or fiction. I don't think I've read a novel since college!
With reference type material you can just stop at anytime, put it down, then pick it up again weeks later without feeling you've missed anything or broken some flow - novels you have to stick with and I guess they make me feel like I've taken on a burden that I have to commit time to. Once you start one you kind of feel locked into it (same way I feel about those nighttime TV dramas everybody loves - I gave up on those because I got tired of having this commitment to make sure I was home certain nights of the week or that I set my VCR or that I catch up on last weeks details, etc.)
Comics are easy - they're over in about 10 minutes, plus if you do put one down for a while you can always recap in a matter of seconds by looking at the pictures!
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