I am a first year student on a F1 visa in Boston. I entered the US (and MA) in September 2009 and lived off-campus in a leased apartment. Am I a part-year resident for the year 2009 or a non-resident ? [I've only spent 130 days in MA in the year 2009]

You are a non-resident alien, and will continue to be so while under the F-1 visa through 31 December 2013.