Has been implemented in towns in Canada and USA, but im not aware of it in Aus yet.
Great idea mate (well, actually I hate the idea as I hate parking fines!). But the councils are already onto it. Anything to increase fine revenue they love.
http://www.news.com.au/heraldsun/story/0,21985,25357444-2862,00.html
"Cameras set up in Footscray will snap motorists after 90 seconds for stopping in no-standing, loading and bus zones and the local council will issue fines up to $138.
"In a Victorian first, Maribyrnong City Council is to use the system in a six-month trial.
"The council expects one camera, at the corner of Paisley and Leeds streets, to detect 13,000 offences a year, potentially worth almost $2 million."