Ian, as of May 1, Amazon started paying the standard commission rates on both the Kindle reader and Kindle editions. That means the bonus rate of 10% on the readers was dropped, and that they started paying again on Kindle editions, after paying 0% for the past year and a half.
Also, Amazon pays a pretty generous royalty to authors/publishers, so anyone who can WRITE a technical publication (you, Damon, anyone else) of just about any length (does not have to be book-length) could earn quite well in that direction. If I didn't have a print book out (with its own Kindle edition) I'd be heading down that road, and selling publications through Kindle and probably on the Apple iBookstore as well.
What does it take to author a Kindle doc (special software, brain surgery by Amazon, ???) and what is the minimum typical length, eg for a snappy "How to install Solar" or "Things to check around your home to save Green" guide?
I'd be quite keen to sell one of those adapted from my site for the cost of a click on a Google ad frankly. But wouldn't want anyone to be feeling short-changed given the customs of that medium.
Damon, I really don't know much about it. But I believe you can directly convert a Word doc into Kindle format. And you should check out the potential "competition" on Amazon (particularly on amazon.com, where you'll get more of your sales, I would think) to see what is being offered in your particular area. But I do know that people offer magazine articles, book chapters, and so on in Kindle format.