From Adobe Systems:
Adobe Dreamweaver CS5 software empowers designers and developers to build standards-based websites with confidence. Design visually or directly in code, develop pages with content management systems, and accurately test browser compatibility thanks to integration with Adobe BrowserLab, a new Adobe CS Live online service.* CS Live services are complimentary for a limited time.
Adobe Dreamweaver CS5 software enables you to develop with PHP-based content management systems such as WordPress, Joomla!, or Drupal; design with powerful CSS inspection tools; and test your web pages across browsers with Adobe BrowserLab, a new Adobe CS Live online service.