Following up on
http://lists.centos.org/pipermail/centos/2006-January/059877.html
wherein Dag et al spaketh
... Public key for lame-3.96.1-3.2.el4.rf.i386.rpm is not installed.
A solution to this problem would be if Yum also explained for what repository the key was missing (not only for what package). If you'd be so kind to help out, you could report this on Yum's bugzilla (and post the bugzilla id here as a reference)...
Bugzilla ID 554
http://devel.linux.duke.edu/bugzilla/show bug.cgi?id=554
status has changed from "new" to "assigned".