I have a 17-inch, late 2011 model MacBook Pro running OSX 10.8.2; 2.5 GHz Intel Core i7. Not sure if all of that was necessary but I tried. Today, I was exporting a PSD file from illustrator into photoshop, and Illustrator crashed with the message that my drive was full and that I needed to free up disk space. So, I did. I removed a lot of files that I didn't need, applications that I never use, backed up music and photos - to no avail. It now says I have less storage space than before I started. However, it also says in another window that I have more space than before. I'm confused and I'm posting images below. Please help!