Canon is about to make a big splash by launching Project 1709; announced at Photokina last week. Project 1709 will allow photographers to store their entire library of photographs online. As with most cloud services, the images would then be available from anywhere in the world, accessible using any device (e.g. computer, tablet, smartphone, Internet-connected camera).
The service is currently in closed beta, but you can pre-register on the website to be notified whenever it opens up (or to be invited when it expands its testing stage).
Not much was revealed, however one can watch the video to get an idea of what the service will be like:
The service should be launched sometime in 2013.