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Mmmmh, try Textures on the Macs....
I think it can compile TeX while you are typing and display the result in real time.....so, it is as close to wysiwyg as you could make TeX (I might be wrong).
You still have to learn TeX (or LaTeX) though
Personnaly, I use MiKTeX distribution on windows with the TeXshell free editor (nice, simple, customizable, powerfull and improves my productivity)...
Remember : Keep It Simple Sweety