Here's a nice solution to aggregating photos and GPS data, which I found as a link at Elastic Space: Tokyo Picturesque, which maps images onto a satellite image of the city, and lets you browse through them.

Never quite figured out what to do with the gathered images from whereabouts over there -- but this does prove a simple and elegant interface can provide a compelling way to go. But I sure ain't there yet -- perhaps if I continue to pile up the pictures, I'll get enough source to want to dig back in.