I use one by Biologic. Works great! easy on and off with a Ram mount. I haven't tried it in a downpour yet though, but in a light rain it's waterproof. Twisted throttle sells them. http://www.twistedthrottle.com/shop-...s-cradles?p=10
FYI, the link is for a iPhone 4.
"If I can't pass at a reasonable speed I do it unreasonably." - jdmetzger