Johanna and Robert have offered two great resources to consider. I was wondering, what do you consider a "decent" interest rate? Also, you don't say how long you want the money to stay there.
If the money needs to be safe, you don't want to add risk by switching from cash to something else (like short term bonds and money markets, they all have that risk). There are only 5 places I know of to park cash and not have it exchanged into something else. Bank savings accounts, bank CD's, Insurance company FIXED ANNUITIES and FIXED LIFE INSURANCE POLICIES. The other place is under the mattress or buried in the back yard.
You may want to consider Fixed annuities instead of CD's. Many have penalty free access to some of your money from day one. You can get them in terms from 3 years to 10. 3 year contracts are paying up to 1.75% and 5 year to 2.5%. This is quite a bit more than the ban and you can access 10% of your money after the first year without the penalty of early withdrawal (surrender charge).
If you are looking for a place to keep cash and have it be more liquid, heavily front loaded life insurance policies are currently yielding 3-5% tax free and your money is in cash. It takes a bit of finesse and technical understanding of the tax code and insurance contracts to do this. A policy must be "reverse engineered" properly to make that happen and get those rates of return in the early years of establishing the contract.
Make sure if you decide to go this way, that the person you are working with understands the tax laws that set the parameters for funding a policy to it's maximum in order to avoid changing the tax advantages in the contract in a way you weren't expecting. You can me if you like, but there are a number of planners throughout the country that understand how to do that. They generally will need to be familiar with TRA '86, TEFRA, DEFRA and either LEAP, Circle of Wealth or Infinite Banking concept. Most other advisers will get it wrong.