hit detection/scene management

Can anyone tell me, (ie. give me a URL) where I can learn good methods of hit detection/scene management?

For the game I'm making right now, I don't need to do anything too complicated (just check if small projectiles are colliding with stuff on the screen), but in the future, I may want to make a game where everything on the screen can collide with and react to anything else on the screen.

Thanks.

[429 byte] By [carmichaelbaby] at [2007-9-27 17:02:39]