Don't forget YQL, the weather APIs, Pipes, and Flickr. I personally think BOSS was a bit mishandled, but it has really great potential, as does YAP/YOS. Yahoo

Don't forget YQL, the weather APIs, Pipes, and Flickr. I personally think BOSS was a bit mishandled, but it has really great potential, as does YAP/YOS. Yahoo is one of the largest collection of professional web developers, and they take that seriously. Of course, their money is in Average Joe offerings like News and Frontpage. I do work for them, and for a developer offering team too boot, so this is quite biased, of course ;)