A lot of links has been broken, so I´ve tidied up and added a few
ROMANIAN PHILATELY Romfilatelia Filatelic Federation Romanian National Philatelic Museum
Romania shown by its stamps Romanian revenues    
COLLECTORS Fritz Heimbuchler Paul Hirsch Dan Dobrescu
Jay T Carrigan Laszlo Kallai    
AUCTIONS/ DEALERS EBAY(own frame) Ebay Germany (this frame)
Ebay Germany (own frame)
Heinrich Koehler
  Sandafayre Philea Klassische Philatelie
David Feldman Harmers of London James Bendon Corinphila Auktionen
Philatino Delcampe    
BULGARIA Stamps of Bulgaria Bulgarian Post Bjorn Bakken
HUNGARY Hungarian philately Hungarian Postal history Brittish Hungary site
CZECHOSLOVAKIA Society for Czechoslovak philately Peters page  
MOLDOVA Posta Moldovei Moldovastamps  
RESOURCES Sweden Postal Museum Collectors Club of Chicago Briefmarken.com
Stamp Link A.J. Encyclopedia Lee's Stamp Listopedia Stamps Listing
British Library Special Collections Stampworld Stamp collecting tips Beginners resource  (Thanks Glenn!)
STAMP EXCHANGE Allstampsparadise