Postal Museums

Postal museum, Stockholm, Sweden
www.posten.se/museum/

Postal Museum, Oslo, Norway
www.posten.no/portal/application/no.posten.menu.om_posten.postmuseet

Stamp libraries and museums, USA
www.stampshows.com/museums.html 

Telecommunications Museums

Norsk Telemuseum, Oslo, Norway
http://www.norsktele.museum.no/

National Museum of Information Technology and Telecommunications, Brazil
www.mnit.org.br/home-i.htm

Vintage Telephone Equipment Museum, USA
www.scn.org/tech/telmuseum/

Telephone Historical Center, USA
www.discoveredmonton.com/telephonemuseum/

Telecommunications and telegraph museum, Lofoten, Norway
www.lofoten-info.no/tele-mus.htm

Telemuseum, Stockholm, Sweden
http://www.telemuseum.se/ 

Post & Tele Museums (Museums of Communications)

Museumsstiftung Post und Telekommunikation, Frankfurt, Berlin, Hamburg, Nuernberg, Germany
http://www.museumsstiftung.de/

Museum fuer Kommunikation, Bern, Switzerland
http://www.mfk.ch/

Museum voor Communicatie, Haag, Holland
http://www.muscom.nl/ 

Philately in Denmark

DFF - Danmarks Filatelist Forbund
http://www.danfil.dk/

Internet exhibition of stamps
http://www.filateli.dk/

Kjoebenhavns Philatelist Klub
http://www.kpk.dk/

Tore Noerby's prize-winning site about postal history and philately
http://www.norbyhus.dk/ 

Philately abroad

List of English language philately sites on the Net
http://www.philatelic.com/
www.askphil.org/
www.askphil.org/b.htm 

Computer Museums

American Computer Museum, USA
http://www.compustory.com/

The computer museum network, USA
www.tcm.org/

Computer Museum, Amsterdam, Holland
www.wins.uva.nl.faculteit/museum

Interactive Museum, USA
www.thetech.org/exhibits/ 

Post

Post Danmark A/S official homepage.  You can also gain entry to Post Danmark Frimaerker (Post Denmark Stamps) via this site.
http://www.postdanmark.dk/ 

Telecommunication

TDC A/S official homepage
http://www.tdc.dk/

Telephone Collectors International, USA
http://www.telephonecollectors.org/

Telecommunications Heritage Group, UK
http://www.thg.org.uk/