Xiangqi

Xiangqi (or Chinese Chess) is a great game very similar to international chess.  At the moment it is possible to play live Xiangqi at clubxiangqi.com.

It would be great if chess.com could host Xiangqi games in the turn-based format.  No one is currently doing this.

Playing Xiangqi helps encourage tactical thinking, and it will certainly improve a person's overall chess performance.

As you said, there are already Xiangqi sites.

For chess.com it would demand a lot of work to introduce such a different game, and the result would be probably something inferior to what already exists in sites specialyzed in this.

Even some Chess variants that are very close to chess were not introduced, like Seirawan Chess (that only has two extra pieces and has basically the same rules)

Fischer's Random was easily introduced because it has exactly the same pieces and only some different rules about initial position and castling. 

It wouldn't hurt though, and like I said no one else is doing the turn-based format.  It's just a bit of wishful thinking on my part.

it's your turn.com has turned based xiangi and like... a few hundred other games.

They have ladders and tourneys for xiangi too.  Actually I thought Xiangi is pretty popular online, maybe you just have to know where to look.

play.chessvariants.org hosts turn-based xiangqi games, along with hundreds of other chess variants.

I like playing in play ok: http://www.playok.com/  , many players : http://www.playok.com/es/xiangqi/  ,  to learning and understand:  Rene Gralla master of Xiangqi :http://elephantchess.blogspot.com/2013/09/vigorous-answer-to-timid-opening-move.html

To  first moves: http://www.elephantchess.com/wxmanual.pdf