secrets app
secrets is an app for changing hidden settings in os X. I found this the other day while bored, and I was able to change some things that where bugging me… and some I never thought of. The reason I was looking to change settings was the fact that itunes 8 no longer allows you to hide the genre of music while browsing. Now fixed 
Another thing I found was the ability to change the dock to a 2d version.. which, in my opinion looks better than the 3d shelf.
2d dock
There are many other settings to change.. and, as of now, I have not fully gone through them.