I've been inspired by some of the hacks in my last article (as well as the ease of programming Google Earth) to make a layer, or as close to one as I can come, with the Perth, Australia public transport system in it. So far I've done most of the train stations, their connections and some 11 bus routes. Maybe a community mapping project (map the areas you know or use) would be a way to get useful map data into Google Earth, much like the very successful www.tvguide.org.au does for television schedules. Comments anyone? I'll post a link to my Earth file later on. Watch this space.