What can $46 billion buy?

So now the Prez is asking for another $46 billion for the war. Sounds to me like we're throwing good money after bad.
What have the other billions of dollars gotten us? Dead Americans, worsening situation in the Middle East and no capture of bin Laden. Gee, what a deal.
What would $46 billion buy us here at home? And how long will our children have to mortgage their future to bankroll a ridiculous war?