You can add the books to your "list". I've never used a bookmark option, but I tend to pick through chapters. It's amazing how your reading habits change when you have access to that many books.

Anyway, I still buy paperback books because I adore them, but Safari is SO worth it simply for reference factor.

The only thing I'm going to have to get used to is reading at the computer vs reading in bed. You mention that they have a lot of books. From what I could tell there really weren't ~that~ many to choose from. Unless the list I'm seeing is only a fraction of what they really have.

http://my.safaribooksonline.com/home?subpage=anonUIbrowse

Is what I've seen so far. Maybe 5 books that I would normally buy otherwise.