http://www.auzentech.com/site/produc...lude.php#linux

Linux Driver
for X-Fi Prelude
Scheduled for Q4 of 2008
(limited feature set)

The first version of the X-Fi Prelude Linux-compatible driver will be very preliminary: expect high-quality output without the full X-Fi Prelude feature set. This driver will help identify which features can ultimately be made available on the Linux platform in subsequent releases. We will post the feature set as it becomes available.
Anyone know anything else that would care to add information?