I don't know if this will soften anybody's feelings on the subject, but I do alot of work in a 4 story building that houses several biotech company's and their labs. The building was originally setup with all receptacle circuits feeding the labs as multiwire branch circuits dispersed among many plugmolds along the tabletops. There are many expensive, and I mean really expensive experiments going on using electrical equipment of all sorts, 365 days a year, 24 hours. Indiscriminate turning off of circuits can ruin lots of long term work. Imagine if this building were wired after 2008 came out and required three pole breakers. IN SUCH A CASE THE PRESSURE TO MAKE THE ELECTRICIAN WORK LIVE WILL BE MUCH GREATER, and the risk of electrocution will go up considerably. Osha smocha, places like that will insist on putting sparky's at risk, you can bet your toolbelts on it. Now go ahead and fire your safety cannons at me, I am just thinking out loud about things that may inadvertanly start to show up once the 2008 comes out. Of course proper design would have this type of facility wired without using multiwire branch circuits, but we will see what we will see.