Hi there
If your earnings are from the US only, and you qualify under the rules to file an 1040EZ return (see other link called 1040, 1040A, 1040EZ?) then yes, you can file a 1040EZ in 2003.
Not sure which state you are from, but you need to file a part-year state return in 2003 (unless you are froma domicile state).
Helen