VirWox has free & open registrations and has an active affiliate program.
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VirWox is the most popular virtual currency exchange when it comes to currencies like Linden Dollars, Avination C$ or OMC. It's pretty easy to buy also bitcoins with Linden dollars.
Possibility to trade currencies that you can never trade somewhere else plus fact that they accept Paypal for deposits, makes it very interesting virtual currency exchange. Plus completely anonymous.
There is one thing about VirWox - not so great support plus high fees compare to other virtual currency exchanges.
When you are interested in currencies like Linden Dollars (from game Second Life) and other exclusive currencies, it's the most amazing place to buy and actually trade them. For example you can trade currency from Second Life to Bitcoin.
Promote VirWox virtual currency exchange and recieve 20% commissions from paid fees by your referrals. Also when your referral recommends someone, you will also recieve commissions for that.
PPS (Pay per sale) - Up to 20% per sale.