Some know web hosting providers with mod_perl support...
http://perl.apache.org/help/isps.html
As usual, if you know of ISPs that aren't listed there (or listed, but not providing modperl support any longer), please let us know.
In the UK, http://www.firstserv.com/ provide an excellent package of services and fully support mod_perl and LAMP platforms. Customer support is exceptional - when you call you talk to a human immediately (remember those days guys?)
-- Jonathan M. Hollin
Digital-Word Ltd. (http://digital-word.com/)