The 30" monitor switches from my work Mac to my personal Linux box. I can hear the work laptop ping with jabber/email/etc, but once I swap the monitor over, the work day is done. Company is persnickety about using external computers and this way code, searches, and network activity stays on their gadgets and mine stays on mine. Helps keep me from being distracted by personal stuff when getting work done.

I found if I could see it, I'd always get sucked in.