I love that you can whack a proper canon flash on the top of it. 
Think somewhere in the pics are my gadgets for it:
270EXII flash
Remote shutter release
Wireless remote shutter release
Lens filter adaptor
UV and CP filters
Wrist strap to replace the neck strap
Official case
Lowepro case/second oem battery/memory cards
Three books on how to get the best out of it.