http://fuchs-online.com/ntpsc/ This is the web address of the Nepal Tibet Philatelic Study Circle, a society of collectors interested in the stamps and postal history of Nepal, Tibet, and Bhutan. It has about 150 members worldwide and publishes Postal Himal, a quarterly journal. If you are a serious collector of Nepal, this is a group worth joining. I have been a member for three years.
http://fuchs-online.com/ Rainer Fuchs has a very nice collection of Nepal, as well as, a number of other countries including Tibet. He has some of his better items pictured online at this site plus some other interesting information. He also maintains the site for the NTPSC as listed just above. He occasionally offers material for sale on eBay. Rainer is a very knowlegable collector and his offerings can be trusted to be genuine and as described.
http://www.bilder-aus-nepal.de/index.html This is a very elaborate German site with a great deal of information about Nepal in general. Click on the fancy picture that first appears on the screen to be connected to the index, etc. If you scroll down the index on the left side of the screen and hit the entry "philatelie", you will find pictures from a very fine collection of Nepalese stamps and philatelic items.
http://himalayanphilatelics.com/ Leo Martyn is one of the world's foremost authorities on Nepal and Tibet. He was for many years the editor of Postal Himal, the newsletter of the Nepal Tibet Philatelic Study Circle, and his collections have won Gold Medals at the International Level on several occasions. He offers material which always can be trusted to be genuine and as described on this web site.
http://Stamp-Paradise.com/ This site has a nice listing of general stamp collecting links.
http://oldindianphotos.In This site has a huge collection of wonderful old photographs of India and Nepal including some particularly nice ones of King George V's royal hunt in 1911.
http://www.bdph.de/index.php?id=1289 This link connects to the pictures of an outstanding 72 page exhibit of Nepalese stationery items.
For Online Discussions and News About Nepal and Tibet Stamps and Postal History go to the NTPSC Forum at http://fuchs-online.com/forum/
The back issues of Postal Himal, the journal of the Nepal Tibet Philatelic Study Circle, are now online. The earlier issues are typewritten and are rather primitive. However, they rapidly improve in quality and contain a treasure trove of information. Go to: http://himalaya.socanth.cam.ac.uk/collections/journals/postalhimal/pdf/
If you have an interest in Nepalese postage meters, you should check out the link below to an extensive online worldwide catalogue of postage meters. It has a short chapter devoted to Nepal which pictures several meter designs which were new to me. https://en.wikibooks.org/wiki/International_Postage_Meter_Stamp_Catalog
There is an interesting thread on the Stampboard relating to British Royal Tours and Visits. It includes several covers relating to Nepal which are worth a look. The link is: