I’ve filled up the iMac’s 300 GB hard drive. I just removed 15 GB of applications and am now running GrandPerspective to see what else I have here that is large. 

My 250 GB external drive isn’t helping when half of it is taken up with an Aperture backup which doesn’t leave enough for Time Machine to do a full backup.

That reminds me that I need to go through Aperture and delete photos I will never use.