Got pam_usb up n running again on my laptop… It was as simple as “emerge pam_usb” and adding a sufficient line to /etc/pam.d/system-auth. Now if the author could get the site back up again…
Edit:
Welcome back Andrea! Glad to see the site is back up, and I hope this means development will continue as well. Integration with pam_mount would be pretty damn sweet… 
The pam_usb by Matthew Schick, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
Done
The site is now back up again.