Here's a great illustrated online comic book which goes through some of the unusual beliefs of Islam (Satan sleeping in your nose or pissing in your ear for example). The whole book is excellent reading though it really gets good after about page 10. It references both Sahih Hadith such as Bukhari and Muslim, as well as the Quran itself.

Nairaland Religion section does a great job of pointing out some of the more unusual beliefs of Christianity and rightly so (I am an atheist after all and I can appreciate the Christianity has its issues). But have a look at this document--it's extremely well done, I'm sure even some Muslims will get a kick out of it (those who can laugh at bit at themselves that is).

http://comics.alisina.org/