SharePoint 2010 Sites

Portal in SharePoint 2007 is now Sites in SharePoint 2010. The following are the new features added to Communities in SharePoint 2010

Feature	Description
Ribbon	Top Menu and Tools are added to the new Ribbon, which is freeze to the top and does not scroll with the content.
Dialogs	Popup windows are now replaced with Ajax based Dialogs
Silverlight	Silverlight is supported, Allows adding Silverlight web parts directly.
Health Analyzer	Helps monitor server status and fix issues quickly
Browser Compatibility	Supports Internet Explorer 7.0 & 8.0, Safari and Firefox
Visual Upgrade	Allows you to retain the SharePoint 2007 look-and-feel if you want, displays a preview of SharePoint 2010 look-and-feel before committing to the new UI
Multilingual User Interface	Now apart from the content the Menu items, List headers, Ribbon text etc also support multiple languages.

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SharePoint 2010
Whats New in SharePoint 2010 ?
SharePoint 2010 Sites
SharePoint 2010 Communities
SharePoint 2010 Content
SharePoint 2010 Search
SharePoint 2010 Insight
SharePoint 2010 Composites