IDE versus source tree.. which has the IDE??

This may seem obvious to the rest, but I am confused as to what to download to get the IDE.. I downloaded the Arduino 1.5.2 tree but there does not seem to be an IDE to launch here..

So where is the IDE??

--thx

Ok, ignorance is bliss :) I found the arduino.exe .. just wasn't clear that was the IDE... mea culpa..

-thx..