The advantage of Photo Stream is that it will sync all your Photos to iCloud. Call it a Photo Backup or Photo Sharing or Photo Stream, it’s all pretty much the same on the new iOS 5 feature. If you take photos with your iPhone, it will automatically shared to iCloud, but for your own purpose, not for everyone else. This also means you can share your photos to your Apple TV. I’ll show it to you later on how to enable Photo Stream for Apple TV.The Photo Stream settings can be found under General > Settings > iCloud and click on Photo Stream and click on the OFF Button to ON.
There are pros and cons for Photo Stream, however, I f0und more cons than pros, and below are a few:
Pros:
1. Ability to share to all your iDevices
2. View Photo Stream in Apple TV
3. View your Photo Stream to other iOS Devices directly
Cons:
1. You can’t pick and choose what goes to Photo Stream
2. Not all Photo in your Album will go in Photo Stream
3. Screen Capture can also go in Photo Stream
4. No way to delete selectively in Photo Stream
How to Turn on Photo Stream in Apple TV
Turn on your Apple TV 2 and be sure you are in iOS 4.4 and up. Then go to the Internet Section, and in that list, above MobileMe, under PodCast, you will see Photo Stream. Click on that and login with your Apple ID and Password. You can then set your screen saver to show what’s in your Photo Stream to add a different flavor.
You can manage your Photo Stream at iCloud.com to reset your Photo Stream, meaning, delete all your Photos in Photo Stream, but it won’t affect your Photos in your iOS Device or the Photos you backed up on your PC or Mac.
To Reset your Photo Stream, follow these instructions:
From a computer browser, go to icloud.com and sign in.
Click on your name on the iCloud home page (this is the page that shows all the app icons). If you do not see your name, click the cloud icon in the top left of the page.
Click Advanced.
Here you will see the Reset Photo Stream button. Clicking this button will remove all your Photo Stream photos from iCloud. Once removed, they cannot be recovered, but you can re-upload any photos you’d like to restore to your Photo Stream from a Mac or PC.
After resetting your Photo Stream, you can also remove any photos that have been downloaded to your device or computers. To do this, follow the directions below:
On your iOS device, you can remove photos from the Photo Stream view by turning off Photo Stream and then optionally turning it back on. You can do this at Settings > iCloud > Photo Stream.
If you added any Photo Stream photos to other albums or the Camera Roll on your iOS device, you can locate and delete these photos manually, if desired.
On your Mac, you can clear cached photos from the Photo Stream view in iPhoto or Aperture by turning off Photo Stream and then optionally turning it back on. You can do this in each application by visiting Preferences > Photo Stream.
If you had Automatic Import enabled in your Photo Stream settings, your Photo Stream photos were also imported to your iPhoto or Aperture Library, and will remain after you disable Photo Stream. If you would like to delete any of these photos from your library, you can to do so manually any time you like.
On your PC, you can remove Photo Stream photos by deleting them from your designated Photo Stream Download Folder. By default, this folder is located at C:\Users\Apple\Pictures\Photo Stream\My Photo Stream.
http://support.apple.com/kb/HT4890