Expression Web is part of Microsoft's Expression Studio 2 and is now able to work with ASP and PHP. Microsoft offers this product free for students to download from dreamspark.com More info »
I've installed the Expression Web 4 trial. I'm impressed with its simplicity and speed.
ExpressionWeb3 dies on large PHP, CSS or JS files. I thought Java-based IDEs were bad, but this offering really lacks in development power.
