ReadWrite differs from read-only and write-only. Since PubwanWiki is a read-only wiki, it is essentially a write-only wiki from the perspective of the present author.
Since ReadWrite SamIzdat is obviously more useful and valued by samizdateli than are non-ReadWrite types, one can reasonably expect (in keeping with the IronLawOfTanstaafl) ReadWrite solutions to be harder for a samizdatelnitsa to get her hands on with limited money, or with self-imposed normative criteria (i.e. NormSpec).
I have established an account (handle 'n8chz,' of course) at http://blogger.com. Perhaps that space has the potential to evolve into a read write samizdat in some sense under my auspices. I will soon be experimenting with this 'blogging' everyone on NPR is talking about for some reason. With any luck the blog concept will be of more service to the pubwan cause than the present ReadOnlyWiki.