It might generate some income from me at least, whenever I have some extra to spend:
http://www.flattr.net/

For example my site has buttons here and there, maybe I got bit over the board, but you get the idea?
http://finnsontrack.weebly.com/

Oh and shameless abuse of thread, you can of course flattr my site if you like to support creation of Volvo 300 mod for rFactor sim

I just got my fist Flattr and it is less than 5 days ago that I set it up, I can recommend it