I dinked around for over an hour yesterday and could not for the life of me get my wife's 3G to subscribe/see my shared calendar. Apple's online tutorial is way vague and/or I'm doing something wrong. Seems to me it should be uber easy to setup.
Wirelessly posted (iPhone 4: Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_0_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A306 Safari/6531.22.7)