Google Data APIs Overview: All your RSS are belong to Google (that joke never gets old…).
GData is a new protocol based on Atom 1.0 and RSS 2.0.
To acquire information from a service that supports GData, you send an HTTP GET request; the service returns results as an Atom or RSS feed. You can update data (where supported by a particular GData service) by sending an HTTP PUT request, an approach based on the Atom Publishing Protocol.
All sorts of services can provide GData feeds, from public services like blog feeds or news syndication feeds to personalized data like email or calendar events or task-list items. The RSS and Atom models are extensible, so each feed provider can define its own extensions and semantics as desired. A feed provider can provide read-only feeds (such as a search-results feed) or read/write feeds (such as a calendar application).
So, RSS is bad now? Is that right? Was there a memo I missed?