Recently GMAC Bank raised the rate on their Money Market Savings Account to 5.3% (thanks Ken at the BankDeals Blog). This is a competitive rate, considering you get pretty easy access to your funds. You can't use this account for everyday checking -- there are limits on how many transactions you're allowed -- but it's great for those larger, infrequent checks that you might write. Take a look at the GMAC account, and see if it's worth your while.
Further reading:
there is a limit to how much you take out.