Anyone can create new pages and edit existing ones. You are strongly encouraged to vist the Preferences page and set your user name, so that we know who left what, but even that is not necessary. This policy may change if this site suffers from WikiSpam.
Update 11 April 2008: Due to Copious WikiSpam this site is currently not editable. As soon as I have time to fix the spam and implement a new policy I will allow editing again. I can be contacted at robertemay at users.sourceforge.net if you have any questions.