If you throw some javascript and "AJAX", you can break out of the php/mysql server-side mode and truly have an interactive game right out of the browser. One interesting option with browser is the ability to render 3D scenes using a raytracing engine (or an openGL engine) on demand and integrate these to the game interface. Raytraced images can end-up looking even better than interactive graphics.
As I mentioned before, I've got quite a bit of code and a prototype for a combat resolution system. If you intend to go work collaboratively, PM me.
Christian
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