To anyone wondering if they could do it to, the answer is yes. I can point to a dozen stories of successful ebooks that have made over $10k in 6 months. Not to mention to increase in credibility and readership that the author gains.
Here are my quick tips on writing a technical guide:
1. Find a topic that is in high demand. I chose designing iOS apps, anything related to popular programming languages or new technologies.
2. Talk about the value to the customer (time saved, better understanding, etc) rather than the features of your product (100 pages, PDF, ePub, etc). You need to mention the details of what the purchaser gets, but that isn't what will sell them on your product.
3. Don't just sell an ebook. Ebooks are cheap and simple or at least that is how they appear. Sell the book, but with it package code samples, video tutorials, expert interviews, and anything else that will give the reader a head start. This has the advantage of increasing the value of your product which helps with pricing.
4. Have more than one package. With my book I had three packages, with different amounts of extras in each. The base one included the book and a couple templates, the middle included 5 detailed video tutorials and more templates as, and the largest one had even more templates and code samples. Each package built on itself and the price increased accordingly.
Many people, and especially companies, won't hesitate to buy a more expensive package if it looks like it will save them more time.
5. Price high. My packages are at $39, $79, and $169. Setting those high prices is the best decision I made. The highest priced package has made almost as much money as the previous two combined. Jim does a great job with a price of $42.
I hope that helps anyone considering selling an information product like what many people on HN have done recently.
For reference you can checkout the sales page to see how my packages are organized: http://nathanbarry.com/app-design-handbook/