Nice find...
My observations suggest these photos are taken with a wide angle lens, to reduce the movement effect of the stars (star trails). Also, a relatively fast shutter speed, and a very high ISO setting as a result.
By fast (for night photography), I would suggest less than two minutes has been used in many of the examples displayed there.
An example,
this photo is a two minute exposure that I took. More detail on ISO, location etc. are in the image description.
Of course, tripod and a manual shutter release such as a cable release is a must. Or you can use your timer, but this will usually limit you to a 30 second maximum exposure.
That should be enough to get a reasonable image if you are prepared to bump the ISO and put up with some noise as a result. Getting the focal point right and knocking the aperture as open as you can for the required depth of field will also help you get more light in.
Another night shot I took is
HERE. This shot demonstrates what I am talking about with the movement effect of the stars (not that they move, but relative to us they do). This one is a 9 minute exposure. I had to stop the exposure there, as the lens was fogging up - it was very cold!
Evidence of the lens fogging up can be seen in the image if you know what to look for - the star trails start off clear, and as they "travel", they fade. A bit hard to make out in the small image, but if you click on "view larger" you can see the fading in some of the dimmer stars in the top left corner.
I have some other night shots from a walk from last year, a particularly clear night, I'll have to dig them out.
