I usually watch LPs on my laptop while playing MMOs, waiting in a lobby or for matchmaking to find a game, or the like. It also ensures I'll never throw away money at a point and click adventure game ever again. I also find them entertaining to watch (or at least listen to, if my boss-sense is tingling) while I'm at work. There are some LPers whose personalities I enjoy immensely (Helloween4545 and the former Freelance Astronauts come to mind for me) and there are others who get me to critically engage with a game (CannibalK9's LP of the Void/Turgor).