Docking station for Macbook Pro that lets you use the book + external monitor
There isn't that many on the market (most users are happy to connect the mac cables manually).  However this solution looks pretty nice :

http://www.bookendzdocks.com/

Hope this helps.

PS Here is another solution, 

http://www.hengedocks.com/

but doesn't allow the macbook to remain open, so you'd need an external monitor, keyboard and mouse.