I'll start. I pretty much pick up anything if it's free. (This has caused issues with my Amazon/B&N Recommends, let me tell you.) There are some genres that I KNOW I don't like, and I stay away from those, but if it's in a genre I like, into the bin it goes.
This has been tremendously fun for my Collector Gene, but it DOES result in a lot of overhead. I like to get covers and metadata perfect in Calibre, and now I'm also stripping out embedded-fonts... it takes time.
But I'm happy.