Free chess server sites sometimes even include a number of chess variants for play, such as on FICS (Free Internet Chess Server). Bughouse is even an option there, though I don't know if it's just for between two players.
I don't know if Game Courier can ever handle very fast-moving games played of CVs, but maybe a special interface like used for [even free] chess servers might eventually be possible, if it seems worthwhile. It might get more members (especially active ones) to CVP site.
Free chess server sites sometimes even include a number of chess variants for play, such as on FICS (Free Internet Chess Server). Bughouse is even an option there, though I don't know if it's just for between two players.
I don't know if Game Courier can ever handle very fast-moving games played of CVs, but maybe a special interface like used for [even free] chess servers might eventually be possible, if it seems worthwhile. It might get more members (especially active ones) to CVP site.