Gary Pretty has a detailed post on some of the new features in Expression Web 2  - I hadn't realised there was so much goodness in it! 

 Gary lists the following:

  •  PHP Support - PHP Intellisense and syntax highlighting, and previewing of PHP sites locally, without the need for a separately installed web server
  • ASP.Net & AJAX Controls  - full support for the standard ASP.Net Ajax controls to simply drag and drop them into your page
  • Silverlight 1.0, Windows Media & Flash -  drop your Silverlight 1.0 applications straight into your site using Expression Web 2
  • Photoshop Support - import any PSD (Photoshop) file and convert it to an optimised image file format

Some neat stuff there!

Cheers

Ian