"Guernsey-Jersey-Man Philatelic Webpages"
 "Guernsey's Post on Postcards" (Leo Mayr)
Judnick Postcards, Columbus, Ohio
"Postcard Webpage by Tom Cretain"
"IPCC Homepage"

Here are some more interesting Alderney links...

States of Alderney Home Page
"Brian Bonnard's Alderney Homepage" (Brian is a resident of Alderney, an author and naturalist)