I was watchng a UK based channel, Military History and there is a program called Dog Fights (I'm sure other countries have, but possibly call it something different).
Anyway it featured a really good dog fight between a P51 and FW190.
Its defo worth a watch if you have a spare 6 mintues.
Aslo sorry about the crap quality, but digi camera was the only way I could get it to youtube.
Enjoy.