I'm using iPhoto '09 and when I first got my Mac, I didn't mind "removing" photos imported rather than selecting the "Delete" option, but after a few years, the memory has really caught up! I take a lot of photography pictures, vacation pictures, etc. So it's about 8 GB in size thats really of value, but theres a total of 33GB! How can I clean out the extra 24GB that's hidden?