I've got a PDair Book Type case http://www.pdair.com/catalog/product...ducts_id=26893.

I'm very happy with it. There are some very minor issues like a tiny clasp that's supposed to keep the device in place slightly protruing from the back and pushing it out, or the magnetic clasp not closing as easily as I'd want, or the keyboard cover increasing my typos rate slightly.

However they're minor enough for me to be happy wih the peace of mind it gives, and the n900 is a slippery little thing. Not to mention that after a month of having it in the case 24/7 I took it out and it looked and felt smaller!