What? Real time & updating display of weblog postings, around the world
How? Weblogs.com + geocoding + RSS
It's a map of the world, with markers for weblogs, as they're updated. Click on the markers and see the RSS feeds.
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And what a beautiful site (via Giornale Nuovo) -- click on the volumes in a bookshelf, and see illustrated pages from old books -- botanical illustrations, zoology, anatomy...