Besides the Harrier & JSF SIG (http://harrier.hyperlinx.cz/), there are other good V/STOL sites out there. Here are what I've found/stumbled across so far:
Harrier .org.uk (http://www.harrier.org.uk/) with a listing of all Kingston V/STOL designs.
International V/STOL Historical Society (http://www.vstol.org) - check out their V/STOL Encyclopedia
VTOL Aircraft of the World (http://vtol.boom.ru/) - a Russian language site with some interesting bits. THis one needs to be readd through Babelfish.