What's new in SharePoint Foundation 2010?

Title: Foundation 2010
Foundation 2010 ( next version of WSS 3.0 ) has the following new features

Alerts Enhancements
Business Connectivity Services
Client Object Model
Events Improvements
Microsoft Synch Framework
Mobile Device Development Enhancements
Query Enhancements
Ribbon
Sandboxed Solutions
Service Application Framework
Silverlight Integration and the Fluid Application Model
UI Improvements
Windows PowerShell for SharePoint
Workflow Improvements

more details here