Ive got an aging Compaq Evo N600 laptop which I use when I'm out and about, and I've been turning it on its side for some time now to read comics with CDisplay.
Great for when I'm sitting in the rocking chair in the darkened nursery while the baby goes to sleep. Kind of like holding a heavy textbook. Takes a little getting used to, but well worth it. Great to read books as well if you can rotate the display with your reader software (I think MobiReader might let you?).