Puck is back up as of around 2am last night. Everything seems to be working, although there was a massive load average spike at first due to all the backed up email being delivered very quickly over Ethernet from our backup mail servers. :-)
The hardware upgrade and move to the new data center will take place in two phases (reboots): first I'll upgrade the hardware, which will live in my basement for a short time; once I'm comfortable that the new setup is stable, I'll move it to the new DC. I'll announce a schedule for this once the new hardware arrives.