How much is Smaug worth?
Michael Noer wrote a side-bar to the Forbes article "The Forbes Fictional 15" giving a conservative value to Smaug and his hoard. The Dragon comes in at #7 on the list.
The Forbes Fictional 15: http://www.forbes.com/fictional15
Breakdown of Smaug's worth: http://blogs.forbes.com/michaelnoer/2011/04/06/how-much-is-smaug-tolke i-dragon-worth/
All that is gold does not glitter,
Not all those who wander are lost. - J.R.R. Tolkien