Oh, and Dean... the Joint Strike Fighter is supposed to have a VTOL variant:
There are competing engine designs. One is just like the Harrier, except with three nozzles, (fore and one aft). The other uses a drive shaft that turns a nose-mounted fan instead of the forward exhause nozzle.
There is a hatch on the back of the plane that opens so that air is pulled into the main engine from above (prevents injesting dust from the regular intakes while in hover).