Describe the usefulness Visual Studio 2008 Split View feature?
The new "split-view" feature that allows you to see both the HTML source and the Design View of a page at the same-time, and easily have any changes you make in one view be updated in the other.
You can customize the split-view arrangement so that you can have the views arranged vertically instead of horizontally - allowing you to make maximum usage of screen real-estate on wide-screen monitors and laptops. The good news is that this feature is now enabled in Beta 2
Visual Studio allows you to set the default view (Split, Source or Design) and to choose between a horizontal split and a vertical split. Especially this last option is very handy when you have a widescreen monitor.
To enable vertical split-view orientation in VS 2008, select the tools->options menu item and go to the HTML Designer->General section. Then check the "Split views vertically" checkbox:
By default VS 2008 opens HTML documents, which includes .aspx, .ascx, and other markup document types, in the split view.
Split view is great if you’re interested in working in the design surface and still want quick and easy access to the raw markup responsible for creating the pretty UI. However... I’m deathly allergic to the design surface and try to avoid it all costs.
Being so designer-averse you can imagine what a PITA it is when every HTML document that I open starts in split view.