I got my first Android phone this weekend, and I've tried four different e-reader programs so far: Kindle, Kobo, FBreader, and Aldiko. Aldiko for the win! It's got a beautiful interface, is very customizable, and best of all, I can drag my epub books into it manually and it will import them with no problem. I deleted the Kobo and FBreader programs. I'll keep the Kindle because if I happen to be reading a Kindle book it will sync between this and my Kindle, and that's pretty handy. If I just had to have one, though, it would be Aldiko. It's very nice.