For the books i really want to enjoy reading and want to share in the future I take a long route
1. Crop with Briss
2. OCR with ABBY Fine Reader and save as formatted text RTF
3. Do some editing with Word and save as Netscape 3 compatible HTML
4. Remove most Word-produced junk formatting from HTML with
www.wordoff.org
5. Do some manual HTML clean up and tweaking
6. Import into Calibre, get metadata and cover
7. Convert to MOBI
The end-result is usually fantastic.