I hope that this is the appropriate place to post.
We have a two-player sword-fighting simulation for the iPhone and iPod Touch called iSamurai: Critical Strike. There are 4 attacks and 4 corresponding blocks communicated between the two devices. So, for example, if an overhead attack is blocked correctly and in time, both devices emit the ring of steel on steel. Otherwise, the defender's device emits one of various cries. And if both players attack at once without blocking, both devices emit a cry.
We know that iSamurai can not compare to a real kendo match, but hopefully some members might enjoy it as another way to compete without bloodshed.
There are videos at our web site at http://toykite.com.
iSamurai sells for $2.99 and there are two free versions for those who would like to try it out.
Toy Kite Software