WebAPI Links
This is just a list of web API providers, directly to their main API page, in no particular order:
- Google - www.google.com/apis
- Yahoo - developer.yahoo.net
- MSN - search.msn.com/developer
- Amazon & Alexa - www.amazon.com/gp/aws/sdk
- PayPal - www.paypal.com/sdk
- eBay - developer.ebay.com/common/api
- Flickr - www.flickr.com/services
- Del.icio.us - del.icio.us/doc/api
- US Postal Services - www.usps.com/webtools
- NOAA Weather Service - www.nws.noaa.gov/forecasts/xml
Don't forget W3C Web APIs Working Group