There are several online surveys of savings interest rates, and one of the easiest to use is from Bankrate.com. Go to the Bankrate website, select the Bank Rates tab, and click on Checking & Savings. Select the MMA and Savings option for either national or local banks.
Be aware that different types of accounts my have different requirements. For example, there may a minimum deposit amount, or a monthly fee may be charged if you do not keep a specified balance. These restrictions can be viewed in the list that Bankrate.com provides.
A similar website is GOBankingRates.com. Your local newspaper may also carry this information in its business section. Note that information on any of these sites may be out of date, and you may need to check with the individual financial institution for final details.