One way to prevent 2 hour meetings is not to let people sit down. We had an unofficial rule to that effect at Viaweb.
I remember once passing by a room and noticing a bunch of people sitting around a table. I must have raised an eyebrow or something, because one of them jumped up and said "We're not having a meeting! We were just talking."
One of the better practices from the world of "agile" software methodology is dropping the team's weekly status meeting and instead having morning "stand-up meetings" every day. Same thing - you don't let people sit down. It completely changes the tone of the conversations, because no one wants to stand in a meeting room for longer than 10 or 15 minutes.
Not to mention that when the status meetings - or, even more significantly, other kinds of meetings (design meetings, planning meetings, etc.) - are spaced that far apart temporally, every meeting just becomes mostly a rehash of everything forgotten since the last meeting. The "agile" folks have the additional insight that reporting early and often is good.
I remember once passing by a room and noticing a bunch of people sitting around a table. I must have raised an eyebrow or something, because one of them jumped up and said "We're not having a meeting! We were just talking."