What are your favorite public REST endpoints?

There are a number of Consumer Web Services in the internet, the eBays, Yahoos, Googles, etc. A number of these use a REST architecture. The JAX-WS 2.0 specification supports REST endpoints, and, with the good integration with JAXB 2.0, we expect a very good developer experience. We would like to collect some public REST endpoints so we can test the implementation (in the JAX-WS project in the GlassFish Community) and possibly also write a few samples.

What are your favorite public REST endpoints?

Thanks, - eduard/o