Sorry, couldn't help the title.

As I understand it, radar is able to penetrate some ways into the ground, with the depth of penetration being a function of the wavelength and the "soil" characteristics.

Personally, I don't put a whole lot of stock in this report. I couldn't find a related paper by the person quoted in the NewScientist article (Bruce Campbell), although he has written a number of radar remote sensing papers (mostly Venus and Mars, it seemed like).

So they fire the radar waves at the South Pole during a favourable orbital position (the libration that Raoul mentioned) and read the few radar waves that got bounced back in our general direction.

The Clementine results were the result of bouncing radio waves off the craters and seeing what Earth-based scopes picked up. The signal was "suggestive" of ice, based on its reflection characteristics.

The Lunar Prospector used a Neutron Spectrometer to look down in the craters. It couldn't detect water, but it did absolutely detect hydrogen.

So it doesn't really matter if it's water or not. There IS hydrogen in the craters, and there's gobs of oxygen all over the Moon, just locked in the regolith.

So we make water instead of finding it. Big whup.

I'm reserving judgement until we send someone or something up there to find a definitive answer. Anything else is just (educated) speculation.

Cheers,
Ken