Well, this might be old news for some but maybe not for others so I thought I would share.  I have been using RedHat (and its derivitives) for ten years or more now, so I have been real comfortable with up2date.  In recent times, I knew yum was out there and you could use one or the other, but I stuck with up2date because after all, if it aint broke, don’t fix it, right?  Well, then up2date broke.  I noticed I was getting errors when trying to check for new updates and after a little research I found that the up2date repositories (for CentOS anyway) are gone, they removed them.  This means that up2date is pretty much useless.  I read up on yum a little bit and installed all of updates (by now there were quite a few that I needed) without a hitch, both in test and production.  So, what I am passing on is that up2date has gone by the wayside, you might can get it to work again with a lot of tinkering, but my advice is to go ahead and make the switch to yum.  You’ll be all the better and happier for it.  From what I read, it does a better job of finding updates and dependancies as well.  I certainly had no trouble with it (so far).  You can run yum check-update to see if you have anything that needs to be updated, and yum update to get them.  These are synonamous with up2date -l and up2date -u.  Enjoy!