The famously trendy shoemaker also makes kneepads:
http://www.jellyegg.com/croc_shoes/314-1/index.asp
] If they're anything like my favorite lounge shoes, they would be very comfortable. They appear to only have one strap, which is a drawback, IMO.
But with our lack of choices in kneepads since the fall of Bomber Gear, I thought I'd throw it out here...