Maybe I talk to Aaron too much, but I'm obsessed with geodata this week. So today the crazy mess of code that is jerakeen.org understands lat/longs on pages, and presents little 'has a location' links next to the tags (I've tagged this one with 'where I'm sitting' as an example). When I syndicate flickr photos, I'm pulling any geotagging data across as well, so you'll be able to see lots of geotagged photos as well.
In the same vein, I've added georss to the Dopplr journal feeds. Items are tagged with the lat/long of the tip or city that they're about. Trip items get their location from the city the trip is to. Not every item will have a geotag, but everything that I can tie to a location will do.
Feedparser (which I use to pull my Dopplr feed into jerakeen.org) needs a patch to be able to parse the GML properly (that patch doesn't apply clean to the 4.1 release on code.google.com, but can be bullied into working pretty easily). So I also pull the lat/longs of my Dopplr updates into jerakeen.org.
I have no idea what I'm going to do with this data. It just seemed a shame to leave it lying around unexposed. I've put it into my RSS feeds as well (I love django), so the stream feed can be dropped into Google Maps for prettiness. And eventually I'll make the 'has a location' links do something more interesting, I guess.