Maria Droujkova is very fun to work with. I have only recently met Yelena McManaman - I suspect she will wow you too. This is very different from most online courses. First, it's very short - two weeks, two hours a week. Second, it's very participatory - you learn about some interesting activities the first week, then try them out with your kids (or anyone, really) the second week. Third, you actually contribute to research in math education when you do this.
The course begins tomorrow, so if you're interested, today is your last chance to sign up.