An excellent article on Visual Studio 2010 new features, and asp.NET 4 ,
a lot of tips to improve your development environment.

Personnaly i love the [tab] [tab] code snippets and the intellisense improvments,

and also, at least available, the implicit line continuation and the automatic properties

A pitty that your website needs to be in asp.NET 4 to have VB 2010 enabled,
otherwise, with say asp.NET 3.5,  it compiles in VB 9., and you get a "bla bla bla not supported in visual basic 9..." when trying to use Automatic Properties... weird