All members of the PPWG are welcome to invite colleagues and friends to join this wiki. Just put their name and email address in the boxes below and then scroll down to the box that says 'send invitations'. Click on this to send the invite to the email address you've provided. Remember that these invites often end up in people's 'spam' folders, so you might have to send it more than once.
if you already have a Wikidot.com account
it is worth it and is free