How do you keep track where you are in the book?
I personally don't have a set method. Sometimes I use bookmarks, other times I fold pages, but usally I trust leave the page number to my memory or try to read to the end of a chapter and remember the next chapter's number.
The only palahniuk book I used a book mark on was Invisible Monsters, and thats mainly because I got one for free with the book.
Sometimes I use the book flap as a book mark if it's hard back.