IntelliSense in Visual Studio 2010
IntelliSense has been improved to allow for acronyms based on Pascal casing. For example, typing String.INOE and then a non-alphanumeric character will convert the call to String.IsNullOrEmpty. This still doesn't prevent IntelliSense from interfering when you're writing code that doesn't exist, as you would with a unit test.
For more details, read my Product Spotlight about the Visual Studio 2010 IDE.