I missed the news by a few weeks, but last month Quantum released StorNext FX 2, their Windows, Unix, and Linux client for Xsan-hosted SANs. The update brings bug fixes, Windows Vista compatibility, and support for 64-bit operating systems. It is a free upgrade from previous versions.
Apple's migration guide says that yesterday's Xsan 2.1 update is supported, too.
More information can be found on the SNFX Support Site. Quantum handles requests for software updates online.