Hi, I haven't download anything on my laptop at all aside from skype. I would like to know what are the most useful apps for someone who's into trimming sizes of music, pictures and files? I listen and download a lot of music and upload a lot of pictures. Other than those apps what are the most useful apps everyone uses here? My background is: I'm not in college yet but I am not sure where to look or what apps are out there. I need a lot of opinions. I heard about ONYX, what is that? Is that necessary to have? Tell me what i need. I have a 15" i5 Macbook Pro 2010 mid. 2.4.ghz. 4GB.