iCloud's free* now, actually. It became a free service when they transitioned away from the MobileMe branding.
* You need a Mac or iOS device to join, though. And you can pay for additional storage if you want ($20, $40, or $100 per year), but that's not necessary.
* You need a Mac or iOS device to join, though. And you can pay for additional storage if you want ($20, $40, or $100 per year), but that's not necessary.