>>I think it's part of the subscription to subscribe to certain users or certain words. Say, I have a few users I'm subscribed to and so I hear 'Your Agent has found something' now and then.
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>So, if I set one up when I was subscribing, and my subscription expires, do the watches stop? There obviously is no way to turn it off once your subscription expires because I don't even see that option anywhere under my setup options.

I believe all the agents are automatically being dropped when your subscription ends. At least as I recall when I had ~ 1 week before renewing my subscription through my new job, I didn't see any agent messages.