Google Maps has made it really easy to draw lines on its interface, that’s good to keep a small walking-log of last few days in Berlin.
The city is gigantic, it’s a tiring experience urban-hiking all day long (make me remember Paris before I got my skating shoes) and I’ll switch to bike in next days (or next summer) to discover the city further.
Mixing Google Maps KML output and Google Earth, you can obtain the superposition showed on the picture. Today, it takes a bit of time to point all the way on the map, it sure could be helped by some GPS tech, and some GeoRSS from Flickr, or PicasaWeb, would help a lot to show the photos taken during the trip.
GPS + Camera hacks already exists today, and I hope it would become mainstream in near future (less than 2 years).