In the latest FC3 updates push, the header for netpbm-10.28.1 pushed, and the devel package pushed, but the actual RPM did not. This is blocking YUM updates completely, which makes it a security issue too...
Ok, adding lmacken and notting to Cc list. I don't push FC updates myself but it's done automagically at the moment. Maybe someone I just Cc'd can help to fix it.
Looks like it got resolved.