Rolf Ebert posted a near-complete Ada scheme to the PN feature request tracker on sourceforge (RFE Tracker) looking for help to getting it working. I finished the scheme off and it will be available with the next version of PN or you can download it now from here: PN Ada Scheme.
To install, just drop into your pn\schemes directory and re-start PN.
I tried hard to make a PHP scheme, but I can’t get everything to work right. It would be nice if someone with a better understanding of the scheme file would either make a php scheme or just write a quick article on whats what in that file.
Cheers,
Aditya
P.S. Almost forgot, PNotebook is awesome. Just waiting for plugins so we can all have inbuilt FTP! =D