I'm sorry to hear about your diagnoses too. I had gestational diabetes with my last 2 pregnancies. I would suggest looking at one of the South Beach Diet books. It had some good tips on choosing foods that wouldn't cause my blood sugar levels to jump, and had a few good recipes, too. Thanks to the good diet, I didn't have to use insulin at all for my second pregnancy.
From what I've read, my children are at higher risk of developing Type 2 diabetes as they grow up. But eating a healthy diet and physical activity will help their bodies stay healthy even with the genetic tendency towards diabetes. None of my 5 boys have diabetes right now.