wow been away for a few days and this is still going on Anway back on topic. Space is what -300 degrees right wouldn't that be more than enough to cool the reactor? How much heat can a nuclear reactor produce these days?

Oh, there are various reasons why. As sophlogimo said, heat is only radiated at a certain rate from an object of a set size. You cannot exceed that rate, and it is quite obvious that a nuclear reactor would by far exceed the cooling provided by the surrounding space.

Also found an article about E-Cat being real cold fusion reactor. could this be the future power source for us?

It sure seems that way, or at least NASA sees the possibility:

http://www.youtube.com/watch?v=42hrCRx1JJY

That may, by the way, be a reason to make spaceships in all kinds of shapes to increase their surface area, particularily around the engines...warp nacelles, anyone?

http://www.youtube.com/watch?v=0c-1EvJK5PQ another vid, from some articles and vids i have watched they have said this may be out in a couple of years!!!!! I wonder how much power cold fusion can produce, hopefully it will be enough for the Vasimr engine.

and this http://www.youtube.com/watch?v=2Zgmdo4C1VQ

That, and transfer the heat throughout the ENTIRE ship... we now instantly have an internal heater!

can't they just eject the heat out into space or find a way to channel the heat out in to space or recycle it?

In order to eject the heat, it would be required to have something that carries that heat, which then can be ejected. That would mean yet another resource that is required and consumed during the operation of the vessel.

The solution that has been proposed instead are radiators - large, antennae- or solar-panel-like structures on the surface of the spacecraft that radiate the heat away. Of course, with a very big reactor, very big radiator "forests" would be needed, or materials which are able to radiate the heat away much faster than the materials that are known today. ("Thermal superconductors"?)

I imagine some spaceships might look quite weird because of all those radiators.

From what I understand heat can't be transferred through a vacuum unless it is carried via some form of radiation.