In the general idea of webserving on a kindle:
imagine you are surfing the web and find an interesting article. you open a new tab to your kindles webserver page and copy/paste the url into a php form and hit OK. the html is then converted to a .mobi file for later reading...
https://github.com/raiju/phpMobi
This would take a bit to make work i'm sure, but it does sound feasable, right?