I am a fan of fidelity. They have a cash management account with checking features. You can choose between a bank sweep at ~2.5% or a money market at almost 5%.
Edit: There are always non-checking accounts that do better than the above, but I think there is real value in focusing on your checking account -- if you have to move money back and forth to get good rates, is that worth the effort and what's the opportunity cost of the funds that sit in the low paying checking account.
Edit: There are always non-checking accounts that do better than the above, but I think there is real value in focusing on your checking account -- if you have to move money back and forth to get good rates, is that worth the effort and what's the opportunity cost of the funds that sit in the low paying checking account.