I've been keeping this quiet for whilst I've been working (read: bugfixing) on it, but now it seems stable enough for general consumption. It's open by invite; you'll have to pester existing users for them. Currently myself and SS are active, but he'd probably object to being pestered by the hordes, so PM me your e-mail address if you're interested.
It's still being worked on, so please don't expect too much from it just yet. I'm always looking for new feature ideas, so if you have any please say so.
The address is
http://www.bpsite.co.uk/Pyre, although it won't do you much good without an invite.