Hey people this is a dumb question I'm sure.. but...

My kindle just arrived and I can't connect to a wireless network with it until I get home from work - so I've just downloaded a few books from the glutenburg site to try it out. Basically i just downloaded the kindle version to the PC and then copied them into the "documents" folder on the kindle. Is this ok? I can read them ok but I'm wondering how I can organise these better - I tried putting them into sub folders on the kindle but they are still all just listed on the kindles home screen in a list.