I'll start with Books on Rman in this first post on books .
Oracle RMAN Pocket Reference
Robert Freeman has a wonderful set of books for Rman in both the 9 and 10 flavors. I keep both at hand for help supporting my 9 and 10 Databases. They have helped me tremendously in supporting backups and restores for my databases
9i Rman Backup And Recovery
10g RMAN Backup & Recovery
I would definitely recommend these as must on hand books for any recoveries or backup help.