Mozilla and Netscape 6.1 (granted, essentially the same thing) both come with WYSISYG HTML editors. I've never used them, but I would think they are just as good as what came in Netscape 4.7. You can get Mozilla at http://www.mozilla.org, and Netscape at http://www.netscape.com.
That is very usefull as well, I enjoy the quickness of using Omniweb for quick html editing, although if you want a good html program and text program bbedit for OSX is the best to date...if you want something free use Text edit or Omniweb
Adobe has announced GoLive, but it of course isn't shipping yet. As for non-WYSIWYG although I use BBEdit daily, I was going to buy Pepper until Barebones software quickly whipped up an X version of BBEdit. I had already bought BBEdit, so I got the free update, but for any that haven't bought either yet - Pepper is cheaper and just as good.