I once wrote two posts saying that people are mistaking the context (location) for the end game and that location is (also) a key context, but most people don't know this. Two years or so after I wrote those posts, the concept of location based mobile services and location based apps shows no sign of dying off. I see lots of new location based apps and whilst they're almost always nice and glossy, not that many of them really grab you as a neat and innovative idea. But every so often, one does come along which makes you slap your forehead, like the scientists in the 80's ads for Tefal, and mutter under your breath ... that's so obvious, why didn't I think of that?