A bit late on this one, but 
Nvu version 1.0 is out. Since the 
Mozilla organisation started making separate, stand-alone apps to complement/replace the multi-purpose 
Mozilla Suite (such as the 
Firefox browser and 
Thunderbird mail client), the composer (html editor) component has been lacking. Nvu is that html composer, and is, as expected, available for Mac, Linux and Windows.
Also, 
Firefox 1.05 is out today, 
Apple have released 
OS X 10.4.2 (best to get it through software update) and a new version of 
iSync, and Microsoft have issued some patches through Windows Update.