Recently my 13 year old son wanted to install some new software on his Mac but found that he didn't have a lot of disk space. Surprising, given that his Mac mini came with a 320 GB hard drive. So we did some snooping around and discovered the culprit: dozens of gigabytes of space taken up with games that were installed using Valve's Steam software. We deleted what he wasn't using and freed up more than 80 GB! Here's how you can do the same.
Full story from the iMore Blog...