[arch-general] Invalid signatures

[David Rosenstrauch]

Saw these errors from pacman today, which are preventing me from 
upgrading some packages:

error: directfb: signature from "Eric Belanger <eric at archlinux.org>" is 
invalid
error: xmms2: signature from "Sergej Pupykin <arch at sergej.pp.ru>" is invalid
error: failed to commit transaction (invalid or corrupted package (PGP 
signature))

Anyone have an idea what's up?

DR