We always have two members watching all games in our league.  Either the 2 managers H2H or a moderator watching a team play CAM.  It's not that we don't trust one another, it just removes all possibility of controversy.

For a long while we used Netmeeting, but Vista and Win 7 took that away.

We then moved to Skype most recently.  It's not too bad, but as far as I know only allows one other person to watch at a time.  Also it can be a little blurry if the linked participants aren't using the same screen resolution.

Now I have found this.  https://join.me/

This actually loads up in your browser and allows you to send the link to multiple individuals. 

This might come in handy for leagues moving into their postseason.  It always makes the games a little more exciting with an audience.