iPhone Easily Subscribe to US Holidays, Sports Team Schedules, Movie Release Dates, and More!

iPhone 3.0 features Calendar Subscriptions, where you can enter the URL for a shared calendar and near-instantly add it to your iPhone. That’s all well and good to share a family or business calendar, but what about more wide-ranging ones? What about national holidays, religious events, movie release dates, sports team schedules? Luckily, Apple’s already