HP Releases Universal Print Driver, in the New Product Announcements forum on BrianMadden.com

It supports most HP printers dating back to 1997.

Taken from whitepaper[/i]
Using the HP Universal Print Driver for Windows in Citrix environments

The HP Universal Print Driver for Windows, available for free from hp.com at http://www.hp.com/go/universalprintdriver, is supported by HP in Citrix and Terminal Server environments. HP has tested the HP Universal Print PCL 5 and postscript emulation drivers in Citrix environments. For network printers, the HP Universal Print Driver for Windows can be installed on the Citrix server for all clients to access as a universal driver. When printing with the driver, a user can either specify an IP address or search for all available network printers.
For autocreated printers, the HP PCL 5 driver can be mapped to print to all PCL 5-capable HP client printers or the HP postscript emulation driver to all postscript-capable HP client printers through driver mapping in the Citrix management tools. For autocreated printers that are available over the network from the Citrix server, the HP Universal Print Driver can print directly over the network to the printer by IP address without sending the print job through the client. For autocreated printers that are connected directly to the clients via USB or parallel port, the Universal Print Driver cannot detect the Citrix port. If such a configuration is desired, or for any other questions,
please contact wts.laserjet@hp.com.

Read the complete whitepaper at:[/i]
http://support.citrix.com/article/CTX110571

this will be awesome for those of us still on Metaframe XP and can't take advantage of UPD III