This is an interesting story from the San Francisco Chronicle. It proves a point that blogging can really be about anything and if you grab or reach out to a specific audience you can potentially start a new career.
Granted Donnie Davis had some writing background however this was started from being excited at being a grand parent - and that is exciting from personal experience.
Check out the link below and enjoy. From the article there is a link to GaGa Sisterhood - neat site.
Blogging grandma recruits others