Now I remember why we didn't move these websites sooner -- some scripts depended on CPAN modules that aren't installed on the servers from our hosting provider. Anyway, other than a few minor hiccups (e.g., hardcoded absolute paths buried in a php script), the sites are up ... and running (for the most part).

Tomorrow: install Ubuntu on the web server (was Red Hat), and set-up a couple of Piwik environments.