Several areas of .NET 4.0 and VS2010 support or are dependent on EF:
WCF Data Services
Windows Azure
Dynamic data framework
ASP.NET AJAX Framework
You can, of course, use EF anywhere in your application, but you may find it is particularly suitable to some areas, such as:
ASP.NET MVC
Silverlight/WPF (many controls have built-in EF support)
ASP.NET (many controls have built-in support for binding to EF objects)
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