Yahoo-owned Flickr is a great photography service - I've been using it for years as my default companion photo storage solution.
It's not just the fact that everyone gets a whopping one terabyte of free cloud storage for their photos, Flickr features a bunch of advanced options and keeps your photos backed up in the cloud in their full resolution.
Flickr's iOS app has been nice, albeit a bit rudimentary in terms of features. This changes with today's release of an all-new Flickr version 3.0.
Some of the many new features iPhone photography fans will surely fall in love with include the ability to record, edit and upload high-definition video, photo auto-tagging, comb through your photos using complex search criteria, access detailed photo data, share easily and quickly to Tumblr, Twitter and Facebook and lots more...