Available sounds include:
(all file names are case sensitve and must be exact)

AppLaunch.aif // Application launched sound
ButtonPress.aif // Button pressed sounds
EnterTheme.aif // Theme entering sound
PlaceBlankIcon.aif // Place "No Icon" in edit mode
PlaceNewIcon.aif // Place App Icon
StartEdit.aif // Enter Edit Mode
StartUp.aif // Start up sound (boot) 
StopEdit.aif //Exit Edit Mode