Last week I said I would donate money to wikipedia if they did this. I just donated $50 just now via credit card through the main page.
Seth Godin was right when he said "If the user supports it, she owns it. If support comes from anonymous government money, or some corporate sponsorship, then the interactions don't matter so much, and it's more distant from you." I have never felt closer to Wikipedia than today.
http://sethgodin.typepad.com/seths_blog/2010/12/who-owns-wik....