I agree with the above posts:
- Yes that would be "wrong" to give donators more maybe, then again it is ok to show gratitude by giving something, like a tag, a thank note or something - t-shirts is nice, and i would buy one when/if it comes no matter what, but i think we all can agree on, that we dont really want anything or demand it, we just want to show our gratitude in a new way.
Dont really know, but doing what you do, is the best thing you can ever do
But the best thing i can think of, is probably either a thank note, tag(might take time to automatic as u said Ross though) - but even better an easter egg or special video, but something that everybody can watch of course. Then everybody would be happy, you would use your time to do what you already do, and thats why we are donating