How to get some life out of an Xserve G5
I've written a Howto on installing and patching OS X server on an Xserve G5. I'll probably keep adding to the Howto over time as I discover new things that need updating. If you're using a newer Intel Xserve then this howto will still work of course if you're running an older version of OS X Server, but to be honest seeing as Server is so cheap in the app store you're probably better off simply updating if you can :-)
Anyway I hope you find it useful - let me know if anything doesn't work for you!