As some of you undoubtedly know, reflectors (mailing list) for a lot of different things have sprung up like weeds on Yahoo! Groups. I must admit I've contributed to this trend starting about six years ago, as I wanted sources for more information on some of the unusual rigs I was collecting and using.
Anyway, here are the reflectors I am involed with. All of these manufacturers have made equipment suitable to QRP operation. Of course, some of it is incredibly rare.
Some of the reflectors, like the Mizuho/Nishi Musen and Tokyo Hy-Power lists, are well established and have over 100 members. Others are just starting.
Mizuho/Nishi Musen: http://www.mizuhoradio.com
Shimizu Denshi: http://groups.yahoo.com/group/shimizudenshi
Tokyo Hy-Power: http://www.mizuhoradio.com/personal/k7vo/thp