Great Group Idea!
I just found another Blogher homeschooling group that is just starting up: The Resourceful Homeschooler. It's a group for exchanging information about good resources. What a great idea for a group!
To get the ball rolling, I'll toss out one of my favorite general resources: www.freelyeducate.com. This a blog which posts free resources on every subject a few times a week. (And I'm no way affiliated with it, beyond being a faithful reader.)
www.learnateveryturn.com (creative, enriched homeschool)
www.curiousmindgarden.com (my creative niche)
Blogher group: Homeschool Breakroom