Repair an RPM database safely:
http://www.rpm.org/hintskinks/repairdb/∞

RPM cheatsheet
http://michal.guerquin.com/rpmcheatsheet.html∞

RPM tricks
http://nakedape.cc/wiki/RpmShellNotes∞

Building an RPM from SRC.RPM
http://fedoranews.org/hoyt/rpm/∞