I bought the official case from TMO. It's a little pricey but provides excellent protection. As a matter of fact, the faucet in my bathroom leaks and I left my tablet on the counter one night. I woke the next morning and my tablet was sitting in a puddle of water that extended halfway up the case. Took the case off, wiped everything down, and plugged it back in. Worked fine. Even the liquid indicator was still white.
T-Mobile Springboard running ICS Beta 2 Rooted
Dell Venue Pro-Stock