My associate HR wiz says - ask each individual what their preferred way of working would be, and equip them to work that way. So my daughter for example, has four children, has decided to work at home only two days per week, and they have equipped her with business telephone line, fax, laptop, Email - probable cost to the company 3500 to 5000 UKP per year. What Tools shall we need Other things may be needed. The problem now is to translate the function of these things, not the things themselves, into digital communication terms. A scheduled chat session would handle the social meeting function.
Email is a powerful coaching tool.
A forum is a good substitute for hallway and coffee-machine meetings. Common access documents, with primary author and annotating editors, is a tool that works much better than a stack of hardcopy proposal revisions in your office mailbox every Monday. There are a stack of programs available. You can't just take all your old old skills into the virtual office setting. You have to develop skills and attitudes that match the tools of interaction.