Semantic Ping?

Frédérick Giasson has created a kind of "ping multiplexer" for the Semantic Web. Anyone who creates new Semantic Web documents (he accepts SIOP, FOAF and DOAP) can ping his service and his service will include it in the list of recently updates documents, ordered by type of document.

Very nice, surely an interesting and important component of a Semantic Web. Of course it only becomes interesting when somebody then crawls and integrates the documents - but Swoogle seems to be interested already (see the comments to his announcement here) You can also have a look at the very similar Pingerati which does the same for microformats, but has been around a bit longer and is already integrated with some applications.