A few more ideas to throw out, from the conference:
Take some historic/fictional moms and write their mommyblogs. It would be best done as if some of them know each other in Real Life like me and Squid and Jo and some of them are blog-friends. Imagine Caroline Ingalls cussing up a storm about having to move for the nth time out to MORE in the middle of nowhere with 5 kids, two of them in diapers. (Yes, five - Mary, Laura, Carrie, Charlie - the one who died when Mary went blind - and Grace.)
I think we could get ahistorical and have her be friends with Flora Tristan. Flora's english-language wikipedia bio doesn't explain well, and I'm too tired to go into it, but she was a kick-ass writer and socialist & she lost custody of her kids because of her public writing life.
Maybe a blog from Rebecca of Sunnybrook Farm's mom. Remember her? How she was a sucky housewife because she liked to read novels all the time? Let's get the low-down on that situation.
Mary Shelley and her mom, both blogging. The drama between them when they discover each other's blogs. Imagine Mary Wollstonecraft lecturing Mary Jr. on the flighty pointless evil of novels, and Mary Shelley's pissed-off rebel attitude as she writes them anyway.