how to install mysql on mac?

My Mac runs Mac OS X, version 10.7.5., so it's a 64 bit system. First, I downloaded mysql-5.5.28-osx10.6-x86_64.dmg. Then I double clicked mysql-5.5.28-osx10.6-x86_64.dmg, it's mounted, and shows 1. mysql-5.5.28-osx10.6-x86_64.pkg -> I double-clicked it to run, after clicked buttons a few times it's said to be successfully installed. However, I could not see anything in Applications. 2. MySqlStartupItem.pkg -> I double-clicked to run, also successfully done. However, I still could not see anything in Applications. 3. MySQL.prefPane -> I double-clicked it to run. Now I see a window jumped out, with a button Start/Stop MySQL Server, I clicked it, now it says "The MySQL Server Instance is *running*". I'm a bit lost here: Q1. Why until now there's nothing in the Applications? I can't see any item or folder like mysql there. Is it that every time I want to run mysql, I have to mount the installation package? Q2. What did MySQLStartupItem.pkg install? Q3. Are there any client side tools inside the installation package? I mean, for example, Microsoft SQL Server for Windows, there are Microsoft SQL Server; and there are Microsoft SQL Server Management Studio, which serves as a client tool to browse databases and doing queries; also, if I download "Microsoft SQL Server Express with Tools" package, it will install both. Does mysql-5.5.28-osx10.6-x86_64.dmg contain only the server, or also a client tool inside?