Driver for Xerox Phaser 6200N is already included in lion
if not, dowload the file here
Xerox Phaser 6200 is "True Adobe® PostScript® 3™, PCL 5c emulation with automatic sensing and switching" so it should be able to print even with the Generic PostScript driver
I can't thank you enough Alberto! You might notice that I wrote this on the 30th of April, and Apple did the update on the 26th... I'd spent the morning of the 26th trying everything I could to create a fix to no avail. But today I downloaded the new driver from Apple (Software Update said I was up to date, however, so nothing happened there). I also used IP as the setup in Add Printer, instead of Default. Then, I typed in the address of the printer, and everything was golden! Thank you, thank you, thank you. I don't have to buy another printer now.
By the way, Xerox' customer support simply told me that the driver would not be updated and I should just buy a new printer. I told them that with customer "support" like that, they could stuff it...
Oh, what a relief! I can't stop grinning.