This summer you can choose from a feast of Force.com APIs currently in Developer Preview:
- The Apex REST API lets you surface Apex methods as REST-based web services (webinar signup) Check out Sandeep's blog post about Apex REST, which includes a nice code sample.
- The Chatter REST API provides a nice, clean, REST API for Chatter (webinar signup) Quinton provides a little more detail on this API in his blog post and you can get even more, including docs, by going to the Chatter API resource page.
- The Streaming API delivers HTTP push technology (webinar signup). Check out Pat's description of the Streaming API
