I avoid pdf ebooks, for your exact reason. I have never found a reader that works well for pdf. I think pdf is just not "there" for mobile screens. maybe someday. until then I just search for txt, htm etc books. It is difficult tho because most of the computer books that I would use for reference are in pdf. I carry copies of them just for emergency, but have the real reference book on the shelf to read.
I sometimes use audio books, but I am old school and like to read.