Sharpcast's SugarSync for iPhone provides remote access to your PC or Mac. Sign up for the service ($49.99 per year for 30GB of storage) and install the free iPhone app. On your PC or Mac, select the folders to automatically sync with your iPhone or iPod Touch. The instant you make a change on your computer, it's reflected on the iPhone. Moreover, with a couple of clicks, you can share files or photos -- even those too large for e-mail -- with anyone.