Of course the original Xbox 360 games are no different from the new Xbox 30 slim games.
yes
Yes, the original games work on the 250gb slim. Not all original games will play with the 360 however, see the related links for a description.
It depends on the controller, yes you can because the format of the xbox 360 slim is the same as the original xbox 360 controller
yes
You cant, the only thing you can do is transfer the memory to the new xbox 360 slim with a transfer cable.
yes
You Can't.
No, only Xbox 360 games work on Xbox 360.
Yes they are the same games The system is just samller It will still play Most xbox and all 360 games
No, but some original Xbox games work for Xbox 360.
No, they are different sizes.
No, Xbox 360 games only work for the Xbox.