WaMu is offering $100 to open a free checking account in a branch or online at free.wamu.com. The offer may not be available to all customers and states though. I've received emails from readers who have seen the promo in newspapers or received th offer via direct mail. Members on Fatwallet report the same thing. If you received an offer code, it will be easy to open an account. If you didn't get one, call WaMu and see if you can get in on the offer anyway.
The checking account is free and you must deposit $100 to receive the $100 bonus.