Open any ING account with an initial deposit of $100, and specify any of these working Orange Keys during the online application. You (and the owner of the Orange Key) will get $25 each. It doesn't get much more difficult than this.
You'll also get your own Orange Key so you can make your own referrals, and get $25 each time, up to a maximum of $2000. Here's the referral scheme
Refer 10 friends - get $25*10 + $50 bonus = $300
Refer 20 friends - get $25*10 + $100 bonus = $350
Refer 30 friends - get $25*10 + $150 bonus = $400
Refer 40 friends - get $25*10 + $200 bonus = $450
Refer 50 friends - get $25*10 + $250 bonus = $500
TOTAL = $2000 plus your original $25 bonus = $2025
Once you've got your own Orange Key, visit this site and post it in a comment. I'll then feature it in a new blog post! I made my $2025 in seven months. How long will it take you? Get started!