http://www.bewrite.net/
http://www.smashwords.com/
http://blog.threepress.org/2009/11/1...ee-publishers/
Amazon books only work on a Kindle. B&N books will only work on their suported readers. I think you can get books at Borders and Kobo. They use Adobe epub drm. I think that works on an, Aluratek. Maybe someone else can confirm this.
I like Bewrite Books and Smashword for DRM free books.
Hope this helps.