Stanza+Calibre (must use both): see my n00bie guide
https://www.mobileread.com/forums/sho...919#post391919
Calibre is great for tagging all books (covers, blurbs, author, publisher, isbn, etc) but it's real power lies in keeping a single library with underlying multiple formats - I also spent many a day converting to new formats for a new device - no more!