now Google is developing an editor like frontpage but it's web based.

http://pages.google.com/-/about.html 

also it's worth to look at amaya(W3C's editor)  http://www.w3.org/Amaya/

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Ozan Sirin
Rainbow Turkey Information Technologies
Phone: +90 212 347 47 90
E-mail: ozan@rainbow.web.tr
Web: http://www.rainbow.web.tr