I have so many wallets lying around in so many different places, different computers, virtual machines, usb sticks, gmail attachments, mobile phones, that I have no idea how many bitcoins I actually "own" anymore. I might have forgotten about some of those wallets, who knows? One of these days when I have the time I should try to tidy it all up.
The only amount that I know for certain I've lost so far is 0.05 BTC back in Oct 2010.
So:
9050.03
+ 0.05
--------
9050.08