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I use Mason on a daily basis, it is the core technology behind the sites we develop at [Cosbit Technologies http://cosbit.com] and [Connected Process http://connectedprocess.com].
We also offer virtual Apache/mod_perl Mason sites at [Dragonfli Managed Hosting http://dragonfli.ca].
=== !BorrowMe ===
I am also part of a team working to create the world’s largest and most diverse product lending library, called [BorrowMe http://borrowme.com], where you will be able to find, borrow, lend, swap, and track almost anything with people you can trust. And it runs on Mason.