If a 5% guaranteed investment were available with no withdrawal restrictions, the BankDirect AA miles program would cease to exist.

One of the best rates I know of is a PenFed 3-yr CD at 1.85%. But that locks in your money for three years.

P.S. For those of you not familiar with PenFed (Pentagon Federal Credit Union), they have some of the best rates on loans. I recently bought a new house and got a 2.75% 5-yr ARM with NO closing costs. I didn't need the loan but I saved the closing costs and can pay the loan off at any time of my choosing. And you have to qualify for the loan.

Anyone can join PenFed with a $20 donation if you don't qualify for free membership.

They have a 5% gas card which is free money. I like free.