I've gotten more involved with the GeoRSS efforts and various tools to use GeoRSS for aggregating geodata. After Where2.0, I started working on a project with Mikel Maron for consuming and mapping GeoRSS feeds.
The project is Mapufacture. You can subscribe to feeds, create maps as collections of feeds, and share maps with other users. It's still in very active development (one could call it beta, but I won't), but is usable. Guilhem Vellut is the person responsible for the very nice mapping via YM4R_Mapstraction library. If you'd like to give it a try and give feedback that would be great.
Here are some examples of useful maps created with Mapufacture: