OMG....external flash is sooooo nice, especially Canon's Speedlites.
I've heard the goodness of external flashes, but its all imaginary only.
Yesterday night is the first time I played an external flash
The model is Canon Speedlite 430EX II
The built in flash is no where near to external flash I would say, there are many possibilities with the external flash....
I think, I would get one myself....
(no pics for comparison due to privacy purpose)