I am running low on Hard Drive space so I purchased an external hard drive, thinking I would move my large iPhoto library to that freeing up space. I moved my iPhoto library but it was not as big as I thought and I still have a significant amount of used space on my Hard Drive. My question is, how do I find out what folders, applications or other is taking up this space so I can consider moving that to my external drive as well? I have clicked around for a while in the finder, but I can't seem to find a concise list of the folder sizes. P.S. I found the recommendation of emptying the trash and internet cache to free up HD space, which I have done, but I wanted to get the external hard drive as a more permanent solution.