I'm using a couple of scripts that pull data from websites (imdb, wunderground, etc). the imdb scrip already has a link to go to a movie, etc. but the weather scripts dont give a link so the users have no idea that the data is being pulled from a web page.
It might be a good idea to put an option in scrips to show adverts to the web pages that data is being pulled from so users can go there and maybe click a few ads and what not.