Although a lot of people may disagree, blackberries have definitely helped me with productivity. Being on the West Coast, it allows me to quickly respond to East Coast needs even when I am not in the office so we don't lose a whole day of working waiting for a response from me.
I am also a big fan of email alias'. It allows us to make sure communication is flowing to all of the necessary people so we don't run into situations where someone is left off of a thread.
I also think its important to periodically assess your processes. As business' scale, systems and process needs to be refined to best support the demand of the business today.