Two photons occupying the same space at the same time equals energy?

A photon has energy.

Two photons have more energy.

Energy means different things to different people, but you cannot say that any number of photons equals energy, since there are other forms of energy that don't consist purely of photons (see separate thread:

http://www.thenakedscientists.com/forum/index.php?topic=67135.0)

(1hf+1hf)^∞ =∞E?

I don't understand where the exponentiation (^) comes in; if you are talking about cramming more photons into a small region of space, then simple multiplication would describe the intended effect.

I believe this shows that any ''0'' point of space can contain an amount of infinite energy?

You can't cram a photon into a 0-dimensional point in space, because the photon has a finite probability of appearing outside that region (unless you let a black hole do all the work for you).

There are practical limits to how much light energy you can cram into a small space - once the energy density gets high enough, you can produce a particle and anti-particle (eg electron + positron).