In RHEL we are shipping Seamonkey which as far as current schedules go is not going to be supported by upstream long enough. Therefor we need to re-base to Seamonkey in order to ensure a proper upstream source for security and bug fixes.
Testing seamonkey-2.0.3 package for RHEL-3 is ready at http://people.redhat.com/stransky/rhel-3/, binaries are not available. Build and install them w/o dependencies (with --nodeps).
EOL already.