I just told you.
/System/Library/CoreServices/SpringBoard.app/N45AP.plist
You have to convert it to non-binary first somehow, then open it. It's an XML file containing a list of applications in order on the SpringBoard. Copy and paste them to move them around. Any not listed there get put in some random order at the end. You need to know their COM Identifiers (i.e. com.apple.mobilemail is for Mail.app). Once you are done, put it back on the iTouch in the same place (you do NOT need to convert back to binary, just leave it as a text file, XML.