ClusterShot.com was launched today by Charlottetown, PEI based Silverorange. The site is really pretty straightforward: Photographers post their photos, Clustershot handles reformatting them for display and handles the back-end payments and other headaches.
If you are a professional photographer or a hobbiest, clustershot is an opportunity to get your work out there and to make sure it is available, but without all the headaches of selling your own work.
Finally, ClusterShot takes 12% of the sale, which is more or less nothing when you consider the bandwidth and transaction costs alone. If you look at other stock photo markets, they are priced far higher than ClusterShot.
The site is really well put together, I bought a photo and it was really painless.
Full disclosure (thanks to everyone who emailed!): I was a co-founder of silverorange, but currently hold no ownership in the company or any of its ventures.