version 2.2:
http://rest-client.googlecode.com/
Two prominent feature additions from version 2.1 are:
- Syntax highlight support
- SSL support
The complete changelog is available here:
http://code.google.com/p/rest-client/wiki/ReleaseNotes
New features and bugs can be reported here:
http://code.google.com/p/rest-client/issues/list