http://wiki.developerforce.com/page/DemoREST.java
http://wiki.developerforce.com/page/Getting_Started_with_the_Force.com_REST_API
http://www.salesforce.com/us/developer/docs/api/Content/implementation_considerations.htm
http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_login.htm