Bank savings rate blog BankDeals daily e-mail alerted us to a new relatively high rate from HSBC Direct, which introduces a 3.5% APY for online savings accounts through August 15, 2008. While we still believe money market mutual funds offer consistently better returns than even the highest-yielding bank savings accounts, we do track the highest-yielding bank money market deposit account (MMDA) offerings, such as Countrywide Bank and Capital One Online Savings. In the past, HSBC and others have offered attractice introductory rates, but most of the high-yielding, internet-only banks have underperformed over periods of longer than one-year.