A couple of friends of mine have been downloading like mad. And not all of them are very technical pc users, but are downloading some very large files. So in order to help them out, I am linking a great tool to view the disk usage of your hard drive. http://www.jam-software.com/freeware/index.shtml 

TreeSize is an excellent tool for visualizing the usage your hard drive on a directory basis. The provides invaluable to non technical users who don't have all their downloads organized very well.

Special thanks to the guys/gals at Jam Software for making this tool free.