My stratum 1 gps ntp, ftp, & nat server is running Mandrake 8.2
(Bluebird) and after a couple of years near flawless uptime I'm about
ready to upgrade. Only had to reboot once, because I moved :-)

  I haven't  been keeping track the latest news, etc. What's the best
OS out there for running a ntp sever these days? Compatible with
PPSkit, etc...

Thanks,
dro0st

I would think this is specific not to distro, but Kernel and hardware.
The kernel handles time, so it matters not if it is RH, FC, Mandrake, ect,
within Linux.