I was doing some very short video editing last week using iMovie, and could not figure out why I only had 4 Gb of space to import from my DV camera (which shrank to 1.5 after grabbing 10 minutes of content)– until I looked at the info on my MacBookPro– and saw that my 80 Gb hard drive had 78.5 Gb of stuff! Running that low on HD space is not cool, so I began moving old files to my 400 Gb external hard drive.
Like 4 Gb of old photos. Cleaned out a bunch of iTunes songs (I maintain my library on my other laptop). Dumped some un-used apps. Found a pile of original audio files that had been processed into web ready MPs (another 4 Gb). My small iMovie project had gobbled up 18 Gb! There was something like 2.5 Gb of Second Life snapshots– zap! moved to the external drive. More un-needed source imaqges, videos, etc, moved off the main drive.
When all was said and done, I had made about 40 Gb of nice clean space. Good thing, because I have a shiny box of FinalCutStudio to install so I can get around to some serious video editing.