http://en.wikipedia.org/wiki/Solar_power_station_in_Victoria

It is announced at a price of 11.3 USD per installed effective watt (I took fx 1 AUD = 0.83 USD).

Effective watt = wh effectively produced over a year divided by hours in a year, here effective is 20% of rated watt-peak taking into account day/night/clouds/etc... according to their published data.

The published data from Jerome offshore windfarm:

http://www.eurotrib.com/story/2006/10/26/155548/15

378 millions euros for 120 MW peak, 40% load efficiency (from Jerome comment in the discussion) makes it to 10.7 USD per installed effective watt (1 EUR = 1.36 USD).

Price of installed effective watt does not take into account financing and maintenance.

So we have to compare maintenance cost over the next N years of an on-shore bunch of mirrors and off-shore wind farm. And also to compare photovoltaic expected lifetime (we know that old tech lasted 23 years in hostile polluted environment loosing only 10% of output and probably no maintenance at all) and the offshore windfarm lifetime.

Does that make 11.3-10.7=0.6 USD per installed effective watt? I think so.

So all in all I'd say according to published numbers concentrated solar PV can already be cheaper than wind.