Clustershot appears to be closed, i'll update this review more info becomes known.
Startup microstock sites have to be pretty good these days to make an impact, clusterstock seems to fit this bill, except for the fact that they not a true microstock agency. Slick site operation (it's simple things like automatic calculation of your commission when you enter the price of your images that please), import photos from an rss feed or a zip file along with importing images from a flickr account.
The terms and conditions make interesting reading, but I do hope that someone with legal knowledge has looked over them "Be good and don't do anything malicious" sounds nice as does the first term about you keeping all the rights to your images.
Price of 10 dollars reflects an average of what I have seen, prices can be chosen by you the photograher.
One thing to highlight is that clustershot make a point of themselves as "facilitating the sales of images", i.e. you send the buyers to them using the links provided with each image. Of course buyers will also be able to buy images if they find them by searching from the sites front page.
clustershot do not review images that are placed on sale, so all liability will fall on the photographer. Like mostphotos.com take care when uploading images as there is nothing to stop you from uploading material (photos of people etc) which may later land you in trouble if you do not have the required model or property releases.
This site was a joy to review, I was able to import several hundred flickr images (although I only upload web resolution images to flickr) and also upload several months worth of my microstock portfolio in just a couple of hours. If you had read the previous version of this post I noted the site had one major limitation, it did not import your IPTC keywords. Like all good sites Clustershot have been listening (you'll see a comment below) and they now support import of your IPTC metadata, this makes uploading simple. The upload system is good, you can either browse for a jpeg image (one at a time) of if you select a zip file with several images inside it the site will expand it meaning you can upload up to 100MB of images in a single shot.
To put it simply, it works, and the user experience is "everything where you expect it to be". There is a pro account option which allows you to customise your own domain name and provides several other 'pro' features.
While RSS and Atom feeds might be the future of photographers 'streaming' their work to those who want to sell it, I'd still like to see FTP upload to fit into the rest of my workflow (uploading a ZIP file or using WebDav is convenient enough).
If suitable plugins are developed for gallery software or websites (noted that the developers of clusterstock already have a plug in for their own open source 'pinhole gallery') then with clustershot taking only 12% commission from the sale this could be a very cost effective way of letting a 3rd party deal with sales of microstock. Certainly for full priced stock images then manually linking up galleries to clusterstock images could be quite cost effective.
With the acknowledgement/caveat that I am referring buyers from a travel photo site and that the image collection I'm selling via clustershot contains not just my microstock collection but travel and landscapes which i'd not normally sell as microstock (approx 3000 images) I've sold 9 of then over the past 12 or so months. Not great, but its also not such an unreasonable conversion rate looking at the stats and considdering the subjects uploaded.
Clustershot is a useful tool to any photographer who runs their own site or online gallery and wants to 'add on' selling photos. I'd probably look elsewhere if you are just planning on uploading all your photos and expecting sales to 'flood in'.