I just found this message from Florian Hubold in the cooker mailing list
>todays update for mandriva-release-common from main/updates from
>2010.1 breaks mirrorlist and therefore urpm*-tools altogether
>when a placeholder like $RELEASE is used with mirrorlist,
>and as this seems to be the default setup, many machines
>will be hit by this, effectively disabling package management.
The server for the Mandriva forums appears to be (already?) broken, no
possibility to warn people via that evident way - maybe this copy can
help to minimise annoyance.