Okay. Stand corrected.
Actually, if you look at the site, you'll see how non-standards compliant it is. So Frontpage isn't the only one...
I've only tried FrontPage and Dreamweaver and Nvu, and both Dreamweaver and Nvu produce rather compliant code, but I guess I shouldn't generalize it.
For any serious work, though, write the HTML and CSS yourself by hand. Code generated by WYSIWYG editors are usually redundant, unreadable, non-standard compliant (from, for example, FrontPage), unreliable (renders differently on different browsers), unnecessarily complicated (which makes it unreliable), obscure, fail non-gracefully (because the DOM structure is usually not logical with regards to the layout of the site)... etc.