It's in the "testing" repository:

http://dev.centos.org/centos/4/testing/i386/RPMS/procinfo-18-16.c4.i386.rpm

According to Manging Software with Yum manual, test repo is: " *[testing]* - Packages that are being tested proir to release, you should not use this repository except for a specific reason. It is disabled by default. "

Is curious to consider a package that contains commands like lsof or procinfo as "testing". IMHO, of course.

It's in 'Testing' not because it's considered unstable, but because it's not part of the base distribution and has not had enough feedback or demand to be moved into Extras or centosplus. If you use it and it works for you, please provide feedback either via email to the centos-devel list, or via a tracking bug at bugs.centos.org.

If it doesn't work for you I'd like to know that as well, with information on how to duplicate the problem.

Ok Jim, good explanation.

I've installed it and seems it works fine. Also, is obvious I use lsof and procinfo frequently. As you has said I'll send any feedback about it to CentOS lead team. ;)