Do not use up2date.
The best way of updating fedora is to get the yum.conf file from www.fedorafaq.org
and use yum update
If you like the gui of up2date, then the first thing you want to do is yum install yumex
which gives an even better gui - very like synaptic does for apt.
Yum can provide a great deal of information. Like if you want to know what packages give a particular feature you can yum whatprovides <feature>
. You can look up dependancies and do dummy runs as well.
up2date is getting so bad, I suspect that Red Hat is planning to scrap it for fedora altogether.