I might be the only one who wasn't aware of this, but in case I wasn't...
In the past I've used bustimes.org to find out how far away/late my bus is. Eg.

But yesterday on the bus (due to the 17:45 Swindon Westbury cancellation) I discovered this in Google maps:

It shows all the stops and timings, dynamically updating them as the bus progresses. Really useful if you need an ETA to give your wife who's cooking tea

You can access it by finding a bus stop on the map, tapping it, and selecting one of the buses in the list.
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