I've been secretly building a "commentable Perl documentation web app", which I call AnnoCPAN (for Annotated CPAN). There are still some issues but it already works as a proof of concept. The problem is the hosting; I've been thinking I'll have to pay for a relatively inexpensive host so that I can at least show it to the world; I hope that if it is successful perhaps it could be possible to get some donations or a sponsor to get decent hosting.