If you do lots of work with your harddrive, I would highly recomend getting OnyX. As a free program OnyX has many useful functions that are very easy to use and get the job done. Not only does this application allow you to run things like Disc Utility and Browser Resetting all in one place, it also is loaded with many other options such as system optimization that speeds up the computer, and Cache and Log clearing to open up room by getting rid of unwanted data.

In all, this is an excellent program.