fastfwd has an interesting (well, to book-geek me, anyway) post about dog-earing and writing in books.
Writing in books is the work of Satan and should be punishable by death, but dog-earing is an entirely normal thing to do because I do it all the time.
I suppose this is good in that I don't seem to have one, but then I didn't think I did. Some of the questions were a bit rigid, though, as seems to be the case with these little quizzes. Sometimes I put my needs first, for instance, and sometimes I don't.