  HTS show many puzzling anomalies in their normal state properties. Among them
are:
  - the presence of a peak in the c-axis resistance and its growth in external
magnetic field
  - the anomalous negative magnetoresistance observed above Tc
  - the deviation from the Korringa law in the temperature dependence of the
NMR relaxation rate
  - the opening of a large pseudo-gap in the c-axis optical conductivity well
above Tc
  - the gap-like tunneling anomalies observed above Tc
  - the anomalies in the thermoelectric power above Tc
  We show how all these effects can be explained by the enhanced role played in
quasi-2D systems by the fluctuation decrease of the one-electron density of
states (DOS) at the Fermi level, and its competition with other fluctuation
contributions (AL, MT). The full fluctuation theory in HTS is reviewed and its
resuls compared with experimental data.
