When you start a game with someone, it would be neat to see a list of opponents that you and that player have in common,  similar to facebook's "friends in common".

I figure its an easy feature to create with some value.

Very interesting. I'd like to see this feature as well.

I'd like this.

That would be kind of neat.

where would you display this?

Wouldn't this be kind of hard to make?

How about a link on the profile page right below the link that says:  My Games Against:

Display it the same way as "my games against" does it.. In a grid on a new page.

good idea!

Here's a related idea ... who-is-player-x?

You know.. I'm working on a chess.comm rss feed -reading app that could figure this out.

Chess Calendar:

http://code.google.com/p/chesscalendar/downloads/list

But I was just thinking, I could also have it ping each of your updating opponents feed once (or more times) a day and show who is in common..