PhotoShelter, The Sane Choice.

PhotoShelter, found here, seems to be a satisfactory alternative to selling your soul to the mega
stock agencies. It doesn't cost anything and you get to keep the rights to your images. They also only keep 30% of the sale price, not bad.

Here's a review you might find interesting: look here.

Another stock agency you might want to check out is PhotographersDirect.
I only what I read on their site. If you have any info or feedback on them, I'd love to hear it.