>> Red Hat Enterprise Linux AS release 3 (Taroon Update 4)

Update 4 was released in December 2004, which would put you two and a half years behind on patches. Update 9, which is the last update for Release 3, has been out for several weeks now. (Security patches and some bug fixes will continue until October 2010, according to the Red Hat errata policy page, although they won't be rolled up into "updates".)

You really should make some time to backup your server and get cozy with the up2date command Real Soon Now. You really don't want to discover that you've been 0wned because of a missed security patch.