This older version of Hawkeye (pictured above) from the MASH series has been rejected by premier league bigwigs as being no good at being able to help the ref to decide on close line calls. They are however ready to test a newer version.
For those who want more on the subject there is also an ancient comic book hero (circa 1964) of the same name information about whom can be found here.
And more recently here is a report on Federer having his share of problems with the system during the Wimbledon finals and the plea for the defence.