Hi, I remember that there was a question earlier about how much you can earn with an affiliate program at the different sites Here you go, if somebody finds more information feel free to post it here or if you have further questions pm me. All is well and recently researched but I cant take any responsibility for correctness as the site politics may change J BTW these are all referral links, feel free to use them

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ShutterStock, 0.03US$ per download if the photographer/artist was referred by you as long as these artist is a member of SS !!! Best affiliate/referral program in the trade J
123rf: for 1 year 15% of every purchase of a buyer referred by you and for 6 months between 0.03US$ and 2.00US$ (depending on license) for every image sold by an artist who was referred by you.
Fotolia,10 % commission on sales and 15 % on purchases, no time limit!
GimmeStock, referral by email or try to make your own link out of a referral email sent to your good self

For each download made from the person you referred 0.01 US$ will be credited into your account. So if some of your friends join GS and 30.000 downloads are made from their images, that might be the friends that will help you buy some new gear!
CanStock: For 6 months and up to $50 you can earn 10% of a referred member's purchases and $5 for every 50 photos a referred photographer sells. If they become a photographer and purchases photos, you can earn double commission!
BigStock: 25% of buyers first credit purchase and 5US$ when new photographer hits 75 approved photos.
Dreamstime, 5US$ instantly for putting a badge on your website (pending approval), during 6 months youll get 10% for all sales a referee of yours makes.
Featurepics, will pay 1.5% for referring an Artist whose image has been sold and 1.5% for referring a Buyer. The total referral fees are 3% per Image. Timelimit?
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iStock, For each successful referred buyer iStockphoto pays US$5. You have to enrol in this program from your account.
Imagevortex, requires separate registration, free with a company called sharesale, which manages the referral program on behalf of IV and depending approval of your website, you can get 10% of all image purchases made by referred buyers for 90 days following the first website visit.
Stockxpert, 10% of the value of each credit purchase that has been made by customers who came through ads from your website(s) if they make a purchase within 30 days of their arrival. This only applies to new customers, and only for the first 3 months of their membership. Also here you need to have a website and apply separately for this affiliate program from your account.
Not a micro stock site, but a place where you can sell products with your design without any upfront cost, for the basic shop. Give it a try, its really easy:
CafePress Generally, Affiliates can earn up to 20% commission on each sale of a Qualifying Product in accordance with the Affiliate Commission Schedule. Additionally, Affiliates can also earn up to 5% of the base price for each product sold by a referred Shopkeeper in accordance with the Affiliate Commission Schedule (for one year).