#5 On the list of "Top 10 Mac Applications" is "Onyx".
After using your mac for a while it is going to accumulate junk type files, permissions get changed and so on.
This can cause your computer to slow down and so on.
For this reason it is good to have a application to clean out the crap and check that everything is working alright. There are a few applications that do this but my favorite is Onyx.
Well all these applications do pretty much the same thing... Onyx just does it for free.
You can get a variety of different apps but they cost money and do the EXACT same thing. Why pay?
Onyx also lets you get at some of your Mac's hidden features allowing you to customize things like your Dock, Finder, Dashboard, Login, Safari and other things.
Onyx is a great application to have to do regular cleaning and change hidden preferences.
Definitely worth looking at.
The Onyx Website: http://www.titanium.free.fr/pgs/english.html