Sites as Collections of Pages
See how Sites in SharePoint 2010 just becomes a collection of pages. Unlike before pages now play a key role in the structure of a site. SharePoint 2010 leverages wiki concepts for managing content and extends these concepts by allowing for the inclusion of web parts within the wiki pages themselves. In previous versions you were allowed to add web parts to web part zones. In SharePoint 2010 the developer (and the user) has compete control of the user interface including the placement of web parts anywhere on the page. For instance, this means that it is possible to put the results of a survey next to text describing the survey. So the results of code and content can be commingled on the page to create rich live content scenarios.