A new educational website seeking feedback (and it's free)

My kids and I started a free social learning website at www.flashcardfriends.com we'll start telling the press about it in January, but I'd love to get feedback from the people here first. It enables teachers and students to create online flashcards (complete with images and sounds) and then share them, learn them and test yourself. So far it is spreading by word of mouth at my kids school, and the kids and teachers love it. Ironically, the most popular thing is spelling (try spelling, it's pretty cool). Let me know what you think at mike (at) flashcardfriends.com.