SharePoint 2010 UI Improvements

SharePoint 2010 has a lot of improvements in the UI which impacts the usability of the WCM in SharePoint in a positive way.

Some of the enhancements are:

• Cleaner Markup: The Microsoft SharePoint Foundation (MSF) controls are no longer table based, and all the CSS classes were re-factored and cleaned up.
• SharePoint 2010 is XHTML compliant, and also supports WCAG 2.0.
• Reduced Postbacks / Page refreshes.
• Server Ribbon, which copies the functionality of the ribbon in Office applications.

Reference: http://www.andrewconnell.com/blog/archive/2009/10/19/part-1-improvements-to-the-core-sharepoint-platform.aspx