Yey WarGames has just been on the telly. A great film if ever there was one. Even had a cracking technique named after it.
The film starts off as your typical movie-with-a-geek (ooo, my favourite and he gets the girl, even better :)) so there's the standard geek saving the day, but the film has also got a deeper message about the pointlessness of tic-tac-toe (noughts and crosses) and nuclear warfare.
Early 80s computer movies are the best.