Yes, we had to try out a few. Since we upgrade to 64 bit processors and the 2003 x64 deal, the HP 9050dtn drivers didn't work for us. We were using the PCL 5 drivers but just installed the postscript drivers and they work just fine.
I couldn't find the 64 bit drivers for our color printer but HP tech support said the 64 bit drivers for another printer were okay for the color.
Those 64 bit servers are fast! We got 4 Dell Poweredge 9050's with the dual core xeons. Each one has 6 x 143Gb hard drives. I don't know if that's the exact number but we have room to spare. We could probably power the whole building with this ract of 2U servers. We also upgraded to the Powervault dual LTO3 rack mount backup unit. Our old switch and router was 10/100 but now the Cisco we have is 10/100/1000.... we are gigabit across the board now.