If you have never had a deposit account with Citibank then you might be eligible for this promotion Citibank is running through August 31, 2007. Open Ultimate Savings Account, enter promotion code CSLN, and receive a $100 bonus within 90 days of your first statement.
Citibank has actually just sweetened this deal from $50 to $100 so if you see any mentioning of a $50 bonus — old news. Also, 4.75% APY seems to be a pretty good deal by itself compared to these other options.
You can open your account online (link) or by this number 1-877-695-9400. I called the customer representative at this number and she confirmed the offer. However I am already a Citibank customer and so I was not eligible.
If you do go ahead and open an account, please tell me about your experience in the comments.