Every book I own have bookmarks in them.
I'm never dedicated to just one when reading, rather I just keep switching.
I don't think I'm doing this reading thing properly.
I usually read several at once, different genres so I can keep them straight. A typical combo would be a biography, another non-fiction, a thriller, a chick-lit, a cookbook.
I usually read 2-3 books at a time, usually one is an ebook, one is a hard copy I keep at time home and the other(s) are books I am currently studying. I do wonder sometimes if I would finish my books faster if I was focusing in one book a time.