geolocation - How can I geo-tag a photo after I've taken it?

Is there an app for that? :)

(For when automatic tagging fails)

Answer

Actually I found such an app, after a fair bit of searching.

Photo Geolocator (Google Code)

Currently you can't look up locations via an address, so it only really works for nearby locations, but that's still better than having to edit images on a PC, IMO.