The new version 1.0.13 of the SANE Mustek parallel port scanner driver is available for download.
Sadly, it didn't make it into to SANE 1.0.13 release, but it is available as a patch against SANE 1.0.13 and is included from SANE 1.0.13.CVS on.
It features working support for both CIS and CCD scanners and auto probing for connected scanners. It is now possible to scan without root priveleges.