Before I select a ebook appliance, I would like to know what PC software you guys use to read/manage your libraries. If I can find good software that I love, I will use this to select a appliance that is compatible.

What PC software do you guys love (PC or Mac)? I am struggling with "Calibre" and it is giving me some grief, but it’s strength is to manage your library rather than reading.

What non-proprietary sites do you use for eBooks? (I am afraid of tying myself to Kindle/Amazon or Nook/Barns&Noble). I know about Project Gutenberg and I am using a .txt file and .html file from them for testing.

What other advice, links can you give me before I put some eBook reader on my wish list?