Flew to Melbourne today, for a few holidays + the Drupal Down Under. Had a problem with my K3805-Z stick, wasn't recognised anymore on this machine. Perhaps the Oneiric upgrade? According to syslog usb-modeswitch crashed when inserting the stick. The solution was to get the 1.21 usb_modeswitch, compile and install it, and that fixed the problem.
Good for performance as the always reliable K3565 Vodem worked, but is feeling a bit slow these days.
The only problem I still have is that Ubuntu itself doesn't pickup on the USB sticks anymore. It used to that, perhaps my playing around a year ago to get the K3805-Z working killed things. So need the latest vodafone-mobile-connect-card-driver-for-linux to connect me.