Thanks for the kind words. I spend a LOT of time talking to people, both on (founder) Twitter and in other communities. I listen to people's problems and take notes. I also do some consulting — again, mostly for bootstrapped founders — and often use the issues I help people with there as ideas for my writing.
I have a VERY long list of things to write about, and any work day for me consists of browsing Twitter, chatting with people, and writing articles, outlines, or taking notes. I do that full time, pretty much.
Do you have any good examples? Genuinely curious (particularly about the kind of market they're located in and what happened to the "original" business).
I'm considering even getting your books.
How do you come up with so many new ideas/topics to write about?