If you get a chance, check out the new museum at the Brooklyn Navel Yard. It's free, will take you about an hour, and really cool. The museum basically chronicles the history of the yard from the Revolutionary War up until today. It has videos, artifacts from the war ships they built there, interviews with people and real cool pictures/exhibits.
other recommendations: if you need old film converted to DVD, check out Dijifi in Greenpoint. Also, if you're in that neighborhood, check out Permanent Records and coffee shops etc. Franklin St is a nice walk