I've just posted our ruby 1.9.1p129 src.rpm for CentOS/RHEL4.  I'm
intentionally not posting binary packages, since many people will
probably want pthread support (enabled by default) but doing so breaks
tcltk support.

More info here:
http://labs.mudynamics.com/2009/06/10/ruby-191-package-for-centosrhel4/

Enjoy.

-- 
Aaron Turner
http://synfin.net/
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows
Those who would give up essential Liberty, to purchase a little temporary
Safety, deserve neither Liberty nor Safety.
    -- Benjamin Franklin