By far the best way to get in touch with me is by email. The address is philip dot brien at gmail dot com (sorry to disguise it like that – I'm trying to avoid spammers picking it up).
If you're going to email me, please make sure your subject line is clear, as I'm very likely to delete emails without subjects. Include "Ballpoint Banana" in the subject line if it's about this website.
I'm also on Facebook (search for Philip Brien on the Oxford and London networks), but I won't add you as a friend unless I actually know you. Surprisingly enough.