Homesite!!
Oh wait....ummm...I think Dreamweaver is still popular, as well as Netobjects Fusion. There are decent free tools available too. Amaya isn't pretty (last time i checked), but is strict with standards compliance. The Seamonkey browser has an editor built into it. I thought there was a Firefox extension, but not sure about that.
I think if you're talking about WYSIWYG, everyone is going to have his own idea of what is best.
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/ >) My 84-year-old non-techy mom uses Debian Linux. It ain't that hard.