Check http://www.bankrate.com for options depending on the length of time you have available for the funds to mature.
Locally, I have seen good rates with World Savings, Imperial Capital Bank, and Indymac (in LA). There are slightly higher CD rates out of state (Corus Bank for one, Ascencia for another) but do factor in travel time to get the cash out – most banks won’t return the money electronically and it may take a week to get the check in the mail, and then you have to wait another ten days for the check to clear.
It may not sound like much, but 20 days for your money not to be making interest can be a lot, depending on how much money you have to invest.