If you're looking for a distribution for an aging machine and you want to go with something other than a Ubuntu-based distribution, walk through the Arch with Omega.
Linux is about to get some big performance gains soon from a native feature it already has. Interestingly, Microsoft borrowed ...
Arch-based distros that are actually pushing Linux forward.
Whether you want to run a simple desktop or host your own servers, check out these Debian spin-offs first.