Definitely check out their site: http://novaopenfoundation.org/
You can purchase tickets there for a dollar a ticket. You have until 2:00 EST on September 1 of this year to scrounge up at least $10 for a chance to win some very cool looking armies and support great causes.
The biggest army is an 1850 point Dark Angel Army, and includes several spare special and heavy weapon models, as well as HQ choices, to give you flexibility if you win. 95% of ticket sales will go to Doctors Without Borders.
The other 40k army up for auction is 1,000 points of Necrons, with 95% of ticket sales supporting the Fisher House Foundation, which supports military families.
The final army is for Warmachine fans - a 35 point Khador force, painted "lightish red" in honor of the Breast Cancer Research Foundation, which will recieve 95% of ticket sales.
Definitely check out this fundraiser, and who knows, you might find yourself the recipient of a shiny new army come September.