We have had this requirement recently in New Zealand with EPiServer and in the past when working with Microsoft CMS (the 2001 version used to provide the ability to stage a static site as a standard feature). Our standard approach now is to recommend using a 3rd party tool such as Offline Explorer to crawl the site and create a static version. These tools can be automated to create scheduled versions of the dynamic site, or you can use publishing events to fire the process off. This is useful for archiving, super security conscious sites, or clients with no internet access who want to put the site on a CD (like people on ships in the middle of an ocean). Main thing is to know this upfront and ensure you build the site interface so it can be easily sucked by the tool, so go easy on the fancy JavaScript and flash stuff.

The 4.50 release will contain a feature called content mirroring (or staging) that will include the option to export pages to html. You can read more about it on the following page: http://www.episerver.com/templates/PageWithRightListing____3168.aspx