dmidecode is seriously outdated. the RHEL4 version does not support any options and does not include a manpage. Current versions do :)
newer versions of this tool introduce some incompatabilities which some other parts of the os depend on (such as hal). there's potential for much breakage, at little gain here. Unless we have a customer complaining about a case where the existing dmidecode doesnt work, I don't think we should change it for rhel4.
The thing I was looking for, was the -s option to search for a specific DMI entry. Specifically I wanted to find out the serial numbers of a bunch of machines in a hurry. IMHO let's at least look at this again for RHEL5.
RHEL5 will inherit the latest version of dmidecode which is already in rawhide.