This is very interesting: a multi-user note-taking web-application. Click on this screenshot to get to the 5 minute screencast:
I’d describe Pavel as some kind of “JotSpot Live with tinderbox-ish Notes” (see JotSpot Live and Tinderbox). The secret of the synchron updates of web pages between users is some code called LivePage. It is part of Nevow and that is part of Twisted (which is implemented with Python). Here is an article about Nevow. and some more detailed documentation as well. Twisted has become a grown up in the area of web application framworks. It is extremely powerful as it offers string modules & classes for almost anything you can do with a network attached to a computer. It offers ready made tools for activities many Ruby and PHP developers don’t even remotely heard about! Pavel is just an example.