I knew about this before. But today, as I was administrating the TOEFL test, I took the free time to check out this "we will match you saving" thing.
It is wonderful, and perhaps better than the interest rate.
Not only will the <$1.00 changes be automatically transferred from checking to savings account, the bank will match 5% (100% for first three months) of the change being transferred up to a maxium of $250/year earning for me.
I remember the policy used to be the fact that the Keep the Change feature rounds my checking account balance to the nearest highest dollar and put the changes into my savings account. Now the changes are taken from my purchases with the bank's checkcard. So it is a better idea to make purchases with the card instead of cash from now on.