It is just that we are a minority. You can find lots of stuff on road bikes, mountain bikes, toy bikes, there is even a thriving Utility Bike forum, but the old style bikes that were the mainstay of transportation bicycles since about 1890 or so have to find a place between the cracks. The problem is that bicycles have become adult toys (that ought to get a lot of angry replies), there is very little interest in such bicycles to the bicycling population at large they compare them to their racing machine and do not see what they expect so they consider them junk.

That said, a search for "3-speed" will bring you up several interesting threads (use the search engine in the headers, it seems to work much better than the one that comes up in particular forum. There is a long thread here in C&V and another in Utility Cycling, and some shorter ones floating about here and there.

Have fun, and browse the other forums too, there are often interesting things posted that you would never think to look for.

The only other place I have found much 3-speed stuff is OldRoads.com they have an English 3-speed forum at http://oldroads.com/d_eng_def.asp?rec_count=1

BTW, I am a relative newbie here myself.