Nvidia 3D Vision on any 120hz display

Because it has to have a 120hz input, not just a 120hz output. Most 120hz TVs just interpolate frames between the frames and don't actually have a 120hz capable (dual like DVI or HDMI 1.4) input. Pretty much if it's not on NVIDIA's approved list it won't work.

well what tv's have hdmi 1.4

3d TVs.

And HDMI 1.4 does not currenly do 1080p at 120hz, only 720p.

will the mini hdmi port on a gtx 580 for hdmi 1.4
when will the tech improve
will the gtx 580 be obsolete by then

Yes the mini HDMI on a 580 is 1.4a. The HDMI standard is unlikely to change any time soon, it's the same standard 3d blu-rays use and TV manufacturers are using. For viewing movies or TV 24hz per eye works fine so there is no reason to update it for general consumers. I'm not sure what you mean by when will the tech improve, the tech works fine, you just have to spend the money to buy an actual 3d vision compatable display.

1) to answer benski well i was just saying by the time something comparable to hdmi 1.4 comes to wide range of tv's and other displays would the gtx 580 and hdmi 1.4 be obsolete.

2) also the 580 has 2 dvi ports but it comes with converters to hdmi would that be 1.4

3) is it possable to get 120hz input with a displayport or mini displayport

DVI-D and DVI-I both have dual-link versions that work with current video cards.

1.) No, because the something comparable WILL BE HDMI 1.4, there is no reason it would change.
2.) Yes.
3.) Yes, but I don't think any of the currently available 120hz displays use display port.