When downloading the update to glibc-2.2.5, up2date downloaded the
2.2-5.i386.rpm instead of the 2.2-5.i686.rpm.  This is despite the fact
that I manually upgraded the 2.1.94-3 set of updates to make sure that I
had the i686 package installed.

It seems like up2date should look to either see the version of the previous
package or the architecture of the machine to get the highest level package
available.