Adobe Revel hold a place as the second choice photo archive solution on iOS. Even though it's way more feature rich than iOS build in iCloud / Photostream. It's a good service that I've been testing for a few months now. It just needs more. More features, more sharing options, and better archive options.
It is one of better of the few options for storage of large numbers of photos. Worth a look if you want to tackle and organize a large digital image collection. The Revel app is free, with a free month trial. After that it will cost you $5.99/month or $59.99/year.