During a recent visit to Prague, we were delighted at the amazing transit system in the city. The Metro is clean, fast, frequent and heavily used. The trams are everywhere and also very heavily used, extremely frequent (they sometimes queue up at stops!). The transit system is the very best way of getting around the city quickly.
Here are a couple of video clips
http://www.youtube.com/watch?v=-gHmwqX0jkI
http://www.youtube.com/watch?v=7JZrn5eRz4c