Also, I like "Support Wikipedia" better than "Donate to Wikipedia". I think that the word "donation" has the wrong connotation, more "Disaster-relief" and less "Non-profit foundation"
I prefer "donate". Giving money to a non-profit is a donation, so "donate" is the correct word. "Support" can be in all kinds of forms, for example signing a petition is a way of supporting a cause, no money or anything else with monetary value changes hands. A donation is a form of support, certainly, but if we're talking about donations, why not say "donate"?