you will get a lot of controversy about needing to boil tap water before using it in a partial boil.
Some people will say they have never boiled their tap water first and just used it straight from the faucet with no ill-effects.
Some will say that in order to make sure you have the best chances for a clean, infection free beer, you boil your water prior to using in a partial boil.
I, personally, have done both with no difference. It depends on how dirty your faucet head may be, water quality, and how anal you are.
*edit* like greg down there, i too have taken to bottled water when making my beer.