I have seen problems with installing the Tools Catalog during the initial V8 install procedure. The workaround is to just install Tools Catalog separately afterwards.
One problem may be that recent updates to RH9 no longer work with DB2. I just noticed today the following announcement from Red Hat:
"Red Hat will discontinue maintenance and errata support for Red Hat Linux 7.1, 7.2, 7.3 and 8.0 as of December 31, 2003. Red Hat will discontinue maintenance and errata support for Red Hat Linux 9 as of April 30, 2004. Red Hat does not plan to release another product in the Red Hat Linux line."
Looks like they are abandoning freeware Linux and going to Red Hat Enterprise Linux only.