MOTU is hostile towards Linux.
Support is being added and tested with the help of an advanced user who owns this device, but I (jwoithe) have no ETA yet.
Update on 28 May 2010: code has been progressively added over the past few months. Thanks to Bucky Duster for assistance with protocol capture and early testing. Reports to date indicate that things are shaping up quite well and might in fact be usable in many cases. More testing is required now to identify any remaining issues. See also my comment below from 28 May 2010.