Switch on iCloud for your iOS devices, and it works in the background to sync and back up your data. Photo Stream does iCloud’s photo backup: It keeps your last 1,000 photos on your mobile devices and saves full-res versions on all of your computers.

What’s Hot:
•It’s auto-matic, and iPhone and iPad users never have to worry about backing up and syncing their stuff.
•Photo Stream doesn't count against iCloud storage.

What’s Not:
•Mac users must use Aperture or iPhoto to manage Photo Stream images (PC users just drag and drop in and out of a folder).
•Shared albums won’t come until iOS 6 releases in the fall.

Specs:
•iOS device required; backs up to Mac or PC.
•5GB free; 50GB, $100 per year.