As a hard liner Linux user, I don't care much fro graphics in things like system administration. After switching to a Mac laptop, I basically continued doing the same things in the same ways, just enjoying some benefits of the Mac in terms of multimedia and networking flexibility. Thus, although I was aware of the broken MySQL installer that left the database server unusable, I didn't care much because I found a workaround one minute after being confronted with the unresponsive panel.
The last icon on the bottom right is the MySQL starter.
When launched, it shows a "start mysql" button that the user gladly clicks. With the standard installation package, nothing happens. But, as already noted by Colin, there is a fix that solves the problem.
And now, Mac OS X users can enjoy the MySQL server start and stop in full graphics.