My Mom is up to about 400 books I think, but scarily enough I think she honestly has read most of them. She can still easily read 2 books a day. One of the ladies in her Church is trying to teach her how to do Collections and organize them but I don't think that is going too well. Like others, she is just too far from me to give hands on tech support so I'm really glad the Kindle is so one click and email user friendly.
What's funny is how grumpy she gets now when her books don't show up in about the first 30 seconds of calling me to demand they be put on her Kindle.

"It's not here yet! Where is it?!!!!!" Good Grief she used to have to wait weeks for the Library book delivery system to get her requests to her but now 30 seconds is way toooo long.
Love ya Mom, seriously.