Justin was just able to get the Asus case to fit with the extended battery,
http://www.pocketmatrix.com/forums/view ... hp?t=19973
It is a very tight fit, but does make it.
http://www.proportable.com/detail.aspx?ID=92
I have one that was only used once, it was a bit too bulky for me with the standard battery. I would sell it for $20 shipped if you want.