I have blogged a couple of times recently about co-working. I find the whole movement really interesting. This video goes into the ideas of some of the people leading it in a bit more depth:
I'll add it to my productivity tagged thread. There seem to be two types of post in there: "coworking" and "stripped down writing machines". I suppose that sums up the two things you miss when you are working on your own in your home: creative community and a feeling of a work environment. My writing machine has helped quite a lot with the latter but you can't work round the former.