I glance quickly over the subject lines ... hover my mouse over the few that look like they might be vaguely interesting ... read a small percentage of those ... and respond to a few of those.

I also have my BikeForums main page set up like this:
http://www.bikeforums.net/forumdisplay.php?f=152
... so I only go into the forums that interest me. It's only when I'm bored that I'll venture into any of the others.