top 50 feed namespaces

only the w3c geo namespace shows up in their stats at 0.68%, no sign of
georss or gml.

they seem receptive to discussion. it would be interesting to see more
than the top 50, and attach numbers to these percentages.

another thing would be for blogger to add location information to their
blogs, geourl-style. but that would probably be the start of geo-spam..

-gregor