Have been using Visual Studio 2008 for awhile now so I thought I'd share some great features.
1. Split View - gives us the ability to see both Design/XAML or Design/HTML view on the same screen with real time update ..very cool
2. Document Outline - to turn this guy on goto View -> Other Windows -> Document Outline. This gives you a tree of all the objects on your page. You can use it to navigate to a specific item and it gives you a visual queue of what it looks like + with split view selects the item in desgn and code view.
Using both of these features together is really useful to get to "hard to find elements".
I've attached a screen shot to show both these features in action at once. Here I've selected a button in the Document Outline..it shows a popup of the button, selects it in the design view aswell as the xaml view.