While you are planning your prefab dream house, your kids might get a little jealous. All the Best Bits, a blog about "everything", wrote a post on wild treehouses on Monday. If you buy your kids one of these treehouses, they'll probably love you for life (or at least until they are too old to fit through the front door of their Scallywag Sloop).
Prices aren't listed on the site, but one can only guess that these treehouses cost a pretty penny.
On a similar note, the New York Times ran a lengthy article (subscription required) on treehouses a few weeks back. The article discussed how treehouses aren't just for kids anymore:
"...an engineering breakthrough developed by conference participants, the so-called Garnier Limb, allowed treehouses greater stability and longer life, and before a spate of how-to and coffee-table books helped popularize them. Within a few years, elaborate treehouses, many costing upwards of $100,000, were becoming almost faddish....
As souped-up treehouses have proliferated -- there are now at least several hundred of them in the United States, according to Mr. Garnier -- their designs and functions have become more diverse...[some treehouses] are used for weddings, tai chi and Alcoholics Anonymous meetings."