I'm running out of hdd space pretty fast on my 120gb MBP. I'm using 60gb of it for Boot Camp (and no I can't make it smaller) and all the rest are for OS X apps. All my pictures, movies, and music are already on an external. Is there a way I can start installing programs on my external hdd? Is there a program that can do this? Or is there a program that "spring cleans" my hdd freeing up a few gigs? Preferably free.