Otterbox. They make cases for the Kindle 3 & the Kindle DX plus a few other tablets. My hubby pretty much eats cell phones. He wanted an iPhone & I said not unless you get the best protective case for it. I'm not paying, nor can I afford to pay $500 a shot every time he breaks his phone. The Otterbox case has saved my sanity & my pocketbook. They're pricey but worth it.
The Otterbox cases are fabulous! For phones at least, they make 3 different levels of protection. I believe Defender is their strongest level. Impact is lowest & Commuter is mid-level. I don't know about 'bomb' proof but pretty darn good!!
Here's a link to their Kindle page but you can access any other tablet or phone case from links on the left.
Otterbox Kindle Cases