For a payment card provider we have been developing a series of micro-sites, one per branded card.  Each micro-site is a variant of the same information, with small changes to the text and a different set of graphics and colours.  However the page layout for each is the same.  This allows us to roll out sites very quickly and at a low cost per site.

We use the subsite facility in the CMs which was originally developed to allow us to create multi-lingual sites, but has been repurposed for this client.