Among the following E-groups, we warmly recommend Digiscopingbirds, created by Laurence Poh and currently co-moderated by Stéphane Moniotte, Laurence Poh and Victor Yue. This group, with more than 1600 members, is particularly intended for the discussion of technical issues and not for picture sharing. For the latter, refer to Birds-pix.

Digiscopingbirds 
http://groups.yahoo.com/group/digiscopingbirds/

This is a group for the discussion of all matters related to digiscoping which stands for digital camera scope photography. 

Birds-pix 
http://groups.yahoo.com/group/birds-pix/

This forum is dedicated to birders who also want to share the pictures of birds that they take. It is another interesting medium for bird identification. Members don't mind a little more bandwidth on the email reaching them. All pictures posted are expected to belong to the author or posted with expressed permission from the author. Any picture found to be posted without permission will be removed. 

Photornitho (in french)
http://fr.groups.yahoo.com/group/photornitho/

Liste francophone d'échange dédiée à la photographie numérique et argentique d'oiseaux. Le principe est simple, partagez sur la liste en fichier joint une photo d'oiseau que vous avez réalisée, en indiquant le nom de l'espèce (français et scientifique et si possible anglais), le lieu, ainsi que la date. Indiquez également la technique employée, le matériel utilisé, les anecdotes liées à la prise de vues.

Digiscoping 
http://groups.yahoo.com/group/Digiscoping/

Another e-group about Digital photography with a Spotting Scope. 

Naturepix 
http://groups.yahoo.com/group/naturepix/

If you have taken or drawn a nature picture which you are dying to share with somebody with the same interest, then this group is for you. Subjects such as sceneries, closeup shots of insects and plants, wild animals, etc are welcome. However, if you are posting photos of animals, please refrain from posting caged animals. 
Naturepix is also an open forum to discuss photography, share ideas and information about your works. All pictures posted are expected to belong to sender or posted with expressed permission from the photographer/artist. Any picture found to be posted without permission will be removed. 

Nikon Coolpix 990 User's Group 
http://groups.yahoo.com/group/coolpix990/

This group provides an information sharing forum for owners and users of the Nikon Coolpix 990 Digital Camera. Its intent is to provide convenient infrastructure for 990 owners to share ideas and results with other Nikon owners and ultimately to build-up a highly focused "Knowledge Base" of information particularly useful to the 990 owner.