Hi Christoph! I came here to post the bootstrapped.fm link too, but I think HN is a fine place to post this discussion too. I think the small, bootstrapped company is where it's at for many of us who don't want to or can't do the VC thing in SV. That's probably a large majority even on a site like this.
Rob's book is an obbligatory reference in this space too:
My own thing is not 'successful' in that it's not my main source of income just yet, but it's not too far off, either: http://www.liberwriter.com
One of the key things I've learned from it is to go do something that matters to 'ordinary people', rather than something that's "cool" from a computer guy point of view.
Our customers could not care less about the design stuff as long as it looks decent, so it is not something I have bothered with even now that I have some money I could spend on it.
I image cross-platform compatibility is a PITA.
But I find it interesting that people who pay for ebook design, don't care about website design.
Mind you: That's no criticism of you OR your work.
I just love the fact that people are more interested in the value than in the website design, even if they get value out of design work.
Hope that makes things clearer. Again: You're doing a great job!
eBooks are mostly about stripping out people's "design" stuff and replacing it with some fairly standard components that actually work, and adding in some various bits and pieces in XML, a hyperlinked table of contents, and stuff like that.
There's also a number of podcasts (notably "Startups for the Rest of Us" and "Bootstrapped With Kids")