MacBook Air: What taking up all my hard drive space I have a 128gb MacBook Air running Lion. I am constantly having issues with disc space, but have no idea what is consuming it all. When I look at the disc utility break down, it says about 80% of the used space is taken up by 'Other' while the remaining 20% is photos, music and applications.

I've searched everywhere but have no idea what is using all this space. The biggest program I have on is Photoshop and perhaps XCode. I dont have any video files and I dont even tend to save .PSDs.

Would anyone know what could be taking up this space?

Thanks!
Grand Perspective is a bit of open source software that visualises the space taken up in a folder. Run it and look for the biggest squares. Hover your mouse over a square and the bottom left of the window shows you the full path to the file you are hovering over.

I prefer it to letting the finder calculate folder sizes, because this is much faster and the results are very easy to understand.