Here's a cool site about the BF-109, the German fighter used most often during WWII.
Even after 9 months I still fly Sturmovik, the WWII eastern front flight/combat simulator. It's a great multiplayer experience. One of the most rewarding things I've done is transition from a "turn and burn" fighter guy (driving Russian birds almost exclusively) to a "boom and zoom" fighter guy (driving the Bf-109 G2 most of the time).
The two techniques are completely different, and B&Z takes a lot of practice. Turn & burn is a simple one to understand... the guy goes by you and you turn the airplane horizontally to get on his tail. You always strive to be on the same level as him, and keep turning. Nearly everyone that starts out in combat flight sims uses T&B tactics.
"Boom and Zoom" is what you do when your airplane just doesn't turn as well as the other guy, but is fast. Instead of horizontal maneuvers, you use the vertical to get around. You always try to be above the badguys, pick one out, and dive on him (the "boom"). If he turns you pull up and away (the "zoom"), and then dive back again when you're in position.
It sounds easy, but it isn't. You always have to keep in mind not to try and turn with the guy. Sometimes you'll get sucked into it anyway because he's almost in your sights, and then you're screwed because now you're playing his game.
I think the airforce had a saying "you meet a better class of people in the vertical", and they're right.
Yeah, it means I play the bad guy, but at least I get to shoot down communists! :)