A colleague brought me a recent Wall Street Journal article about the tradition of Stockholmer's summer homes. It's a good summary, but doesn't hold a lot new for frequent readers here.
The article is focused on real estate values. It does a good job of highlighting the huge growth in Varmdö kommun. The key quote is that "buying a one-room apartment in Stockholm is incredibly expensive and the average price of a summer house is much less."
Olle and Janne both told me recently that Varmdö is the fastest- growing area of Stockholm, and I can believe it. The new mega-ICA is just one example of growth in the area; the full busses on the Stavsnäs route are another.
The bus journey between Gustavsberg and Slussen, even at rush hour, is not that bad by European standards. (Although the upcoming 7-year reconstruction at Slussen may well gum things up!) Despite all that, I can see how a home in Varmdö would be a good alternative for people working around the city center.