HOWTO Archives: http://sunsite.unc.edu/LDP/HOWTO/Pilot-HOWTO.html
Official HOWTO Site: http://www.orbits.com/Pilot/Pilot-HOWTO.html
Gzipped documentation: ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/other-formats/html/pilot-HOWTO-html.tar.gz
Main site: ftp://ryeham.ee.ryerson.ca/pub/PalmOS/
Alternative site: ftp://ftp.pfnet.com/pub/PalmOS/. The main site was not working at the time of this writing, but the alternative site had all the necessary files.
There are RPM and Debian-formatted packages available for the pilot-link software. Links to these versions are provided in the Pilot HOWTO document.