i've got a zagg invisible shield for my n900 its THE best cover i have ever had. I've got the maximum coverage one it comes with a lifetime warranty. All you do is send the old one back when you get your new one and you have to pay postage (cheap anyway). When i took the old one off my n900 was as good as new and i work on building sites most days. well worth the money

http://www.zagg.com/invisibleshield/...ns-shields.php