I’m a big fan of the open source Asterisk PBX software and would love to work for a company implementing it. Voxilla has a story with some links to companies developing GUIs to make it a little easier for the average person to administrate. Hopefully this encourages people to look seriously at rolling out Asterisk based VoIP which I think is ideal for almost any business with multiple locations or telecommuters. The only trick so far is to find someone who can implement and maintain the system for you. Maybe this will make it easier.
GUI for Asterisk.