The Principles of Design explains the core elements of visual design:

Balance
Rhythm
Proportion
Dominance
Unity

Make sure to read the article. It will help you make better user interfaces.

IE 7 Beta is available to developers with a MSDN subscription.
Internet Explorer 7 Beta 1 Technical Overview

I’ve just placed this screenshot on my desktop. Great help with capitalization and punctuation. Click to enlarge.

See also MSDN: User Interface Text.