This is a great experiment that has the potential to vastly increase the profitability of SO and the other n sites in the trilogy. The said logos are simple png images which should be easy to block if you are really that bothered by them.
I would recommend the logos in tags to be not B&W but grayscale.
I believe (and hope), as this experiment evolves, the SO team will address the issue of search results lighting up like a Christmas tree with logos by limiting the places where a logo will be shown and the number of different logos on a page.
If they are lucky enough to, say, have Microsoft sponsors the
internet-explorer tag and Sun sponsor the