@Frank Apisa,
												I think that's one of those grammar rules that's really archaic.  I heard a debate on it years ago and it was quite funny.  The only time I ever consciously make the effort is if I have to write To Whom it May Concern; otherwise, no.  It's too unwieldy.
From Scribb:
Where does the “rule” come from? The rule is generally attributed to the 17th-century writers Joshua Poole and John Dryden. They based their objection to preposition stranding on Latin grammar. In Latin, a sentence can never end with a preposition.
So... two guys thought this was a 'should'... who cares?