Edinburgh's local bus company is freaking awesome. I mean, I have a bus stop outside our block of flats and I have a link that tells me, using GPS systems, when the next bus is likely to arrive, and when the next three buses after that are likely to arrive. For each bus route. And wherever I'm going, it's likely there is a bus route that will take me to within a few minute's walk of that location and the bus will probably go down that route every ten or so minutes on a weekday, maybe 15-20 minutes on a Saturday and 15-30 minutes on a Sunday. I love Lothian Buses <3

Main site: Bus tracker - Edinburgh - Real-time bus information
My local bus stop: BusTracker - Edinburgh - Next departures from Restalrig

You can even get maps showing every bus stop on a route so you can find out when the next bus is going to arrive at a certain stop, or just get an area map so you can find a stop and then see what bus will get you there, etc. It's awesome. There are also live updates on the company website detailing things like diversions, not to mention they do the same thing on their Twitter account.

I once left a phone on a bus, and going by the schedule I was able to find out when the bus was going back the other way on it's return route and managed to get my phone from the driver as it came the other way.