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While you are regularly spot-on on the vast majority of points, I'd like to point out some solar thermal designs with storage. While one is now going operational, others are primarily at the pilot stage, and show promise to being ramped up to commercial levels.
http://www.spectrum.ieee.org/oct08/6851
http://www.nrel.gov/csp/troughnet/thermal_energy_storage.html
http://www.sandia.gov/Renewable_Energy/solarthermal/NSTTF/salt.htm
http://www.nrel.gov/csp/pdfs/34440.pdf
Assessment of Parabolic Trough and Power Tower Solar Technology - Cost and Performance Forecasts - Sargent & Lundy LLC Consulting Group Chicago, Illinois
Apologies for the somewhat loose use of terms.
I should have clarified that there are several systems which have good prospects for the storage of solar thermal energy over the period of a few hours - essentially to compensate for diurnal variability.
Amongst them are molten salt storage, flywheel storage, hot gravel and concrete storage, and pumped water storage.
I compacted the situation to some extent by the use of the term 'current' - by which I meant to indicate that without the additional cost of storage, or the arguable and yet to be proved cost advantages (Ausra) as this precise moment solar power stands or falls on it's performance without storage.
Personally I am optimistic on the potential for diurnal storage.