If you’ve been to Wikipedia recently you will have seen this:

Wikipedia being who they are, so so web, they ran extensive testing on the copy line for this.

Read from the bottom of this page to see how it evolved into a moody picture of Jimmy Wales face and a line that’s similar to a request for an organ.

http://meta.wikimedia.org/wiki/Fundraising_2010/Banner_testing

David McCandless has done a graphic for it: