I was able to reinstall yum but still have some error...did the following:

rpm -Uhv yum-3.2.20-3.fc10.noarch.rpm
Preparing... ########################################### [100%]
1:yum ########################################### [100%]
yum update
opennms-unstable-common | 951 B 00:00
opennms-unstable-common/primary | 15 kB 00:00
opennms-unstable-common 113/113
opennms-stable-common | 951 B 00:00
opennms-stable-common/primary | 6.9 kB 00:00
opennms-stable-common 44/44
opennms-testing-fc7 | 951 B 00:00
opennms-testing-fc7/primary | 5.0 kB 00:00
opennms-testing-fc7 27/27
http://directory.fedoraproject.org/y...ta/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: idmcommon-noarch. Please verify its path and try again

Like I told you before the idmcommon repo is BAD. That subdirectory does not exist, thus the 404 error.

Thanks; I also wanted to share with everyone:

This was the yum.conf file that fixed the problem. If anyone needs, I can popst the repo files I have on Fedora 10.

[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=3

# This is the default, if you make this bigger yum won't see if the metadata
# is newer on the remote and so you'll "gain" the bandwidth of not having to
# download the new metadata and "pay" for it by yum not having correct
# information.
# It is esp. important, to have correct metadata, for distributions like
# Fedora which don't keep old packages around. If you don't like this checking
# interupting your command line usage, it's much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
# metadata_expire=90m

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d