"People were meant to share meals together. When I start to get cabin fever I instant message someone until I find one or more people that are hungry.
Another great thing is to tell people that although you are working, they are free to stop by anytime. While at the time it can feel like they ruining your productivity, these are the kind of disruptions that we all need to maintain lengthier happiness.
Third places with wifi are the best. They allow you to seamlessly transfer from production to leisure at will. You can simultaneously be working and available to the public around you."
The commenter was Will Pate, a web designer and thoughtful guy. His blog is here. The Worthwhile blog is a multi-authored blog, like this one--although I think Tom Peters and David Weinburger are way more famous than we are.
You have to like a blog that has subject categories such as Passionate Work, Making a Difference and Creativity--well, *you* don't have to...but I like it.