waterproof iPhone 4 cases?

[hopeful_builder]

do any of you have or use waterproof iPhone 4 cases? If so which ones and would you recommend it?

I've been experimenting with capturing video and taking photos in ponds - I just don't fancy keep using clear plastic bags I "borrow" from my employer.

 

[Sin_Chase]

Lifeproof.

http://www.lifeproof.com/

I do not own an iPhone but know a few people who do with this case. They rate it highly and I handled it some - looks very sturdy.