download here
直接从下载站点得到的信息：
In addition to supporting the production release of the .NET Framework 3.5, the ADO.NET Entity Framework Beta 3 has the following new features and improvements since the Beta 2 release:
Performance improvements
Easier disconnected operation
Extensibility and business logic enhancements
Query improvements
Other
Be sure to download the Entity Framework Tools December 2007 CTP as well for integration with Visual Studio 2008.
直接从下载站点得到的信息：
In addition to supporting the production release of the .NET Framework 3.5, the ADO.NET Entity Framework Beta 3 has the following new features and improvements since the Beta 2 release:
Performance improvements
- Much quicker object query execution
- Simpler generated SQL
- Faster view generation
Easier disconnected operation
- Public, serializable EntityKey property on EntityReference
- ApplyPropertyChanges
- Attach on EntityReference
- Improvements to EntityKey serialization
Extensibility and business logic enhancements
- Partial methods in code generation for property changing and property changed events
- Load with MergeOption
- AssociationChanged Event
Query improvements
- Additional canonical functions for LINQ to Entities
- Apply operator elimination (makes more operations work in SQL Server 2000 and other databases)
- Compiled LINQ query
- ToTraceString() method on ObjectQuery<T> and EntityCommand to facilitate debugging
Other
- Connection management refinements
- Provider interface allows better reasoning about primitive types
Be sure to download the Entity Framework Tools December 2007 CTP as well for integration with Visual Studio 2008.
