There's a systems management app several of us are working on in Fedora space many of you may be interested in...
https://hosted.fedoraproject.org/projects/func/
Basically func is a way to address multiple-systems at once, like SSH, but with much easier certificate distribution and pluggable XMLRPC modules (written in Python), and easy scriptability. Func's certmaster can also be used to distribute certificates to other programs for use in their communications. You can read more on the project page.
There are some interesting demo apps bundled with it, like an inventory application (that uses git for storing differences), and a script which can tell you which computers on your network have exploding laptop batteries :) There are also some neat modules that can gather data from nagios plugins without having to actually have nagios installed.
Anyhow, if you are interested, check out the project page and join the mailing list. We have func already submitted to Fedora, it should be in EPEL shortly, and if someone wants to include this in CentOS testing that's great too. We are very interested in people contributing new modules and scripts for things they find interesting/useful.
Feedback/ideas/comments welcome.
Thanks!
--Michael