Cars, along with lots of other things, are built with parts. If one part wears out, you can replace it without having to replace the whole car. Web sites, more often than not, are not built in this fashion. Data and structure are integrated…there aren’t any parts. So when something on such a Web site wears out (i.e. the site needs an upgrade), you basically have to trash the whole thing and start from scratch. I need to start building my sites with more parts.