Your timing is interesting, as I've been thinking about this over the past few days!
Books are my main thing. I listed 14 books on Amazon yesterday. They're part of a reference series. I bought them several months ago and shouldn't have. Anyway, trying to get something for them. Put aside about 15 books for my church's library, along with 5-6 CDs, and a CD player. Two books to other people.
I've also gotten rid of a lot of paper, some old clothes not fit for public wearing any longer, etc. But I'm also getting rid of other stuff. My cupboards were stuffed, so I packed up 5-6 bags of things for the food pantry. I want to get down to very minimal.
The Miss Minimalist blog has been great inspiration!http://www.missminimalist.com/
ETA: your username seems really, really familiar to me!