Check out the project notes, ideas, and examples at http://github.com/chetan51/eX.
There already exists a syntax called Multimarkdown, but it doesn't support a lot of basic stuff (AFAIK) like multi-line equations, theorems, etc. Basically, it's not as simple or specifically tailored for LaTeX as I would hope.
My vision is to make simple LaTeX document creation easier and faster using this shorthand notation, and to make LaTeX more accessible to the non-technical masses.
What do you think? Is this a project worth spending time and effort on? Would you use it?