The RDF in XHTML Task Force is chartered under the Semantic Web Deployment Working Group and the XHTML2 Working Group.
See the SWD WG deliverables wiki.
The RDFa Bookmarklets show what RDFa can do.
See RDFa implementations wiki.
You can also download a TAR gzip'ed directory of the bookmarklets (2006-05-22) that you can drop into any static web directory, in particular if you'd like to demo these on a local machine. (Note that you will need a local web server running, as browser security restrictions prevent the sourcing of a file:/// URL in a Javascript SCRIPT.)
See RDFa wiki.