As soon as they're read, I pull the books away. I don't want to have to spend time looking for a book on the reader cause it's kind of slow at search.
I have a reading plan. I choose everything about 2 or 3 months in advance and rarely deviate from it.
Before I got the reader, I wanted to have everythig stored on it. I could if I wanted to but it's a lot of work to format everything. Instead it's better to do it as the reading plan takes shape. While formating, I take time to examin the text and savor the read ahead of time.
Books are not like pictures you can't appreciate a whole bunch of them in seconds, so you don't have to get them altogether in the reader. If it only had a 10mb memory I'd be happy with it still.