From ING Direct website:
QUOTE
ING DIRECT is giving you the opportunity to earn even more by referring up to 50 new friends and family! We've cleared all previously completed referrals, so everyone has the opportunity to earn up to $500.
Send your friends an email invitation to open an Orange Savings Account or Electric Orange.
If your friend opens an account with at least $250, we will also deposit a $25 bonus in their new account and a $10 thank you bonus in your Orange Savings Account or Electric Orange.