It is very fun! I was already living in Fall Creek when Porchfest got started, and while I didn't pay much attention to the first two or three -- which were pretty small -- it has been neat to watch the concept catch on and grow. It's exciting to see the brightly-colored little wooden signs go up around the neighborhood in the week or two before the fest, advertising houses that will be acting as concert stages. :-)

The name and idea of a porchfest are free and people are welcome to start them in their own communities! Ithaca's Porchfest site has a page of links to other porchfests, and Wikipedia also has a page about the concept.