Yahoo has announced four new APIs for its Developer Network: Photos, Calendar, MyWeb and Shopping. The Shopping 2.0 API is available now, while the Photos, Calendar and MyWeb read/write APIs will be available soon [updated - thanks Jeffrey]. While they'll be free to use for non commercial purposes, Ash Patel (Yahoo chief product officer) tells us there are commercial offerings coming soon.
Yahoo's new Application Gallery
I remember speaking with ex-YPN chief Toni Schneider about this last year and I was impressed by his vision for a commercial platform for APIs. I'm expecting Yahoo to really the ante with Google and Microsoft in terms of mashup ecosystems. Don't count out AOL and eBay either. [...]