This script below will accept a URL parameter, download the HTML, convert it to a .mobi file with kindlegen, and copy the file onto your Kindle.
TechRepublic had a list of geek books, and user cyberserf compiled it into a convenient text file (itself, a totally geeky endavour).
An Amazon press release said that they sold more Kindle books than paper books. That might be true, but, they probably included the thousands of books being sold for free, or a few dollars. There are numerous public domain books "for sale" on Kindle. I downloaded several dozen.
Here are a few Amazon Kindle tricks.
The web is setting new standards for severely underpaying writers. This blog is a great example: I don't get paid anything at all. There are a number of websites aggressively developing systems that help writers earn as little as 1 cent per word all the way up to 5 cents a word.