The Honda Racing F1 Team announced that they'll be driving without a sponsor in 2007. The car will instead "simply feature a huge image of earth". The aim of the myearthdream.com initiative is "to help raise awareness of the environmental issues facing the planet". I'm sure Wangari Maathai and Al Gore will now start watching F1.
Honda have once again managed to make some noise. Most people's first reaction will probably be something like; "WTF?! F1 and climate change?!". I can't remember the details and the source, but I read somewhere that F1 is actually quite "environment-friendly".
EDIT: Here's a link to the article about how 22 grown men driving around in circles can be "friendly" to the environment. It appears that "Grand Prix racing has been carbon neutral since 1997".
And for Honda this is pretty good PR. It's not like they really need the money from the sponsors. The positive impact this project has on their image and reputation is worth much much more. Their sales in "clean" vehicles probably won't suffer either.
Remember that cool Honda ad?