Help!!!
My Mac is running out of disk space! What should I do??!! Upgrade my HD??!! What if you’re broke like me??!!
Here are 3 steps on how to retrieve those extra bytes:
1. Download Monolingual. If you’re not multi-lingual, you may want to remove unnecessary languages that takes up some of your HD space! After running this application, I was able to free up 681MB of space! Not bad… 
Saved 681MB after running Monolingual
2. Download Disk Inventory to check which files are eating your HD space! Here’s a screenshot of my HD and notice that big blue block??!! Those files are from Itunes! I can’t remove those so I just transfered the hidden video files in our popcorn!
MP3s take up almost all of my HD space!
3. Do it the hard way, manually delete files / applications that you don’t need!
Source: How to Free Up some Hard disk space
