The article below is featured in the Harvard Business Review.  It tries to identify why remote workers are successful in some situations and in others it's a mess.  Like most things in business, it all comes down to how it was implemented.  Just doing it doesn't guarantee success.  With remote users, we tend to focus on wrapping technology around the employee rather than on process.  You really need to set some boundaries and parameters on how a remote worker interacts with the rest of the team. However, even with all of that, you still need to periodically build in face to face meetings to keep the human side of things alive and well.  

This article focuses on communication, coordination and culture as the cornerstones to a successful remote team.  

"The first step is establishing trust. Addressing communication and coordination problems will shore up cognitive trust (based on competence and reliability). But affective trust (based on feeling) is trickier to build virtually — you may need to bring team members together for short periods of time." 

How many times have you said - He is "working at home" today - to your coworker?  Did you use air quotes when you said it and then smile?