They are trying to crowdfund a second edition of their book on Mobile Internet right now.
I found the first edition very valuable. I hate to buy multiple editions of books but the way the technology keeps changing I'm planning on making an exception to that rule and getting the second edition.
Here is the link to their post explaining the project: Help us make ‘The Mobile Internet Handbook’ 2nd Edition Awesome! | Technomadia
. (I don't have an interest in their business, just a happy customer.)
I also have and like their State Lines app. Don't care about the taxes, they are what they are but it's nice to know about traffic laws (maximum towing speed, right/left turns on red etc.) before I get somewhere. All it has to do is save me from one ticket and it will pay for itself many times over.