There's also a pledge you can sign.
I have heard some criticism of Invisible Children as an organization. They support the Ugandan military which has its own issues, they spend a lot of money on travel (which is not uncommon) and a LOT of money on filmmaking (see above).
They may have some problems. But there are a few things I really like about I.C. They are focused on their cause. They have a target in sight and no one can deny that he is evil. They help rebuild schools. And when you sign up to donate through their organization (TRI), they state that when Joseph Kony is brought to justice and his child soldiers are rescued, your donation will end. A lot of charitable organizations have extremely muddy goals with no conclusion in sight...ever. This one may not be perfect, but it has a clear, attainable, worthy purpose. This can happen. Joseph Kony's LRA terror can be over this year.
My friend theothermarkmiller (now So Long Solo), wrote a song inspired by Invisible Children and the conflict in Uganda. It's gooood.