Well, tastes differ, but I tend to get bored pretty quick and can't stand verbose texts. In my mind they have to be briefly worded and exact and that's pretty hard to come by. Uwe Schönings "Theoretische Informatik- kurz gefasst" (similar to: Gems of Theoretical Computer Science) is an example of what I have in mind. It's hard to find something like that, most books are a pain to read (in my opinion).