I recall having made this comment on a talk page
somewhere but anyway :)
Personally I find wikipedia 'strange' in not having ads. I'm not sure I
can think of any other site on the web with a similar popularity without
ads. Even
microsoft.com has ads for Microsoft products. All newspaper
sites do, slashdot does etc etc. So the precedent is certainly there.
Now you can. Very simular popularity in fact. Ok poor example.
How about: