This would also work the other way you know...If he knows you've been reading his logs then he'll use the same method you do to read his.
I dont think plus! or msn will ever make it so you can save it to two different places, thats just stupid. you'd have two copies of all your logs, and if you're on msn a lot then the log space will start adding up.
and only nosey people would need this
why would you read his chat logs anyways? whats it to anyone else waht you say on msn?