ING Direct has long offered a $50 bonus for its Electric Orange checking account. It now doesn't require any reference code. The bonus page is @ www.ingdirect.com/nofees
It also requires that you make either 3 debit card purchases or 3 Person2Person Payments (or any combo of the 2) within 45 days of account opening.
I have more details in my last ING Direct Electric Orange Bonus review
One thing to note is that they have been having promotions on Independence Day and Thanksgiving. The bonuses were $76 during the last Independence Day and $103 during Black Friday. So you might want to wait.