Some of the great diecast communities
The Romanian Diecast Community forum. Mainly in romanian but there are also english and french areas and there are many members that speak these two languages.
1/43 scale only on this awsome english speaking board.
International english speaking board. Great community.
Various collection links
There are out there some very nice collections and you'll find my personal favourites here.
Alex's growing collection. He mostly collects 1/18 scale models from BMW and Bentley but he now started a small 1/43 scale collection as well.
Bomber's great 1/43 scale diecast collection. Also contains some 1/18's.
Other communities I enjoy
The Auto96 forum is a new, but ever growing community of people who are mad about cars. The site also hosts a diecast models section. It needs collectors to make it bigger !