This is vary interesting...
I have a Lether Case for Protection that i bought brand new on E-buy!And you can wear it on the Belt!
It was designed specificaly for Nokia N810,but once you put your device in it.You can only use the Tablet Screan.The Keyboard wont slide down cus of its all around protection.You can use the buttons on the Top,Charge and use the Headsets for Musik/Videos and so on...
Regardless its vary strong and protective on my device...