Instagram will be here soon, but here’s some other alternatives while you’re waiting.
Very cool looking app with lots of filters and great sharing features.
It may have been around a while, but it still has the user-base and traffic.
LiveShare: Beautiful Messaging
This is by the folks from CoolIris and is a good way to share your pictures.
Photobucket – Save Print Share
Another good website-based social-sharing photo site.
Has lots of editing tools and a growing community, plus it’s easy to share with popular social networking sites.