[danielcompton]

I fiddled a bit more and looked at this site to get a bit more info and I have cobbled cjlemonier's script together with the one at the link.

Now you just need to activate the script and it will sync the phone and mac and 'cut' the todos synced from the phone/iCal to do list and paste them into the Omnifocus inbox. The other change is that this now activates iSync if it wasn't running and then closes it after the script has run.

Here it is, again be careful anyone else running this because this will delete todos from iCal.

tell application "System Events"
	set iSyncIsRunning to (count of (every process whose name is "iSync")) > 0
end tell

tell application "iSync"
	activate
	synchronize
	-- wait until sync status != 1 (synchronizing)
	repeat while (syncing is true)
	end repeat
	set syncStatus to sync status
	set lastSync to last sync
end tell

tell application "iCal"
	set theCalendars to every calendar
	repeat with theCalendar in theCalendars
		set theTodos to every todo in theCalendar
		repeat with theTodo in theTodos
			set theTodoSummary to summary of theTodo
			tell application "OmniFocus" to tell default document
				make new inbox task with properties {name:theTodoSummary}
			end tell
			delete theTodo
		end repeat
	end repeat
end tell

if syncStatus = 2 and not iSyncIsRunning then
	tell application "iSync" to quit
end if

This is my first applescript and there are possibly errors or bad practices in the way that I've done this but it seems to work for me.