I've been on iStockPhoto a couple months and echo what jmadigan says to review their extensive instructions. After that, just go for it. You do need to have a thick skin though; sometimes their rejections seem a bit capricious.
I've found the best success with having clean images to start with and doing a minimal amount of post-processing. Shoot at a low ISO to eliminate noise, have plenty of light for good exposure and make sure you're in focus. I shoot raw and about the only thing I do is a bit of saturation and sharpening. If exposure is off a bit, I'll do some histogram adjustment to darken my blacks and lighten my whites. I don't bother much with cropping because they're looking for good base images for others to use; let the user decide how they want it cropped.
Hope that helps and good luck!
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