New Terminal window (assuming new window is created on app start)

New Terminal (iTerm2).applescript

on iTermIsRunning()
	tell application "System Events"
		return (count of (application processes whose name is "iTerm2")) is not 0
	end tell
end iTermIsRunning

if iTermIsRunning() then
	tell application "iTerm"
		activate
		create window with default profile
	end tell
else
	tell application "iTerm"
		activate
	end tell
end if