Frontpage is being replaced by a new project called Expression Web.
Expression Web will hopefully do more with web standards and XML, XHTML and style-sheets, CSS and XSLT.
Q. How does Expression Web compare to Microsoft Office FrontPage 2003 and Visual Studio as a Web design/development tool?
A. Expression Web is a new product for professional Web designers that combines the best of both FrontPage and Visual Studio technologies in a new user interface for creating XHTML, CSS, XML, XSLT, and ASP.NET 2.0. Where appropriate, the user interface and features of Expression Web and Visual Studio are identical (such as for ASP.NET control properties).
I am not a big fan of WYSIWYG developments, but if it seems like they gave Expression Web a bit more thought, and there is a built in panel that will test webpages for CSS and HTML compliance.
Funny though that Internet Explorer still has problems with compliance.