Andy in the comments pointed me towards this site; it works with the GeoURL meme from a while back. Let the site owner explain it:

Real time & updating display of weblog postings, around the world
How? Weblogs.com + geocoding + RSS
Is it really real-time? Nearly:). Weblogs.com updates about once per minute. the geo-blog poller checks about once per minute. and flash checks in with the server about once per minute. so at worse, it’s 3 minutes in the past, at best 1 minute.
Why so few blogs? Only ~10% of weblogs are geocoded
How do I? Add GeoTags and RSS tag to your Blog, then Ping Weblogs.com

Kinda nifty, I calls it. It’s a world map (Mercator projection, I think) with flashing lights representing newly updated blogs geographically. (If you’ve already got the GeoURL code, obviously you don’t need to add it, and if you’re using MT, you probably don’t need to muck with the RSS tag; I certainly didn’t do that, yet Andy found me on the map). Hey, somethin’ for nuthin’! You may already be on the map!