The above post provides a quick look at some of the new HTML designer and CSS tool support in VS 2008 (all of the above features also ship with the free Visual Web Developer 2008 Express edition). 

Because VS 2008 now has multi-targeting support you'll be able to use these feature immediately without having to install .NET 3.5 on your servers.  You can open existing ASP.NET 2.0 projects in VS 2008, have VS 2008 continue to target .NET 2.0 as the runtime target, and begin using these features immediately.

Over the next week I'll also be starting a new multi-part blog series that covers the new <asp:listview> control that ships as part of ASP.NET in .NET 3.5.  One of the big benefits of the <asp:listview> is that it enables developers to have total control over the HTML output emitted in data scenarios.  This works well with all of the new CSS tool features above, and enables you to more easily create great looking web sites and applications.

Hope this helps,

Scott