Execllant all around Propagation Information.
Good all around site for checking solar activity.
Execllant site for watching the progression of next solar cycle.
NOAA / NWS Space Weather Prediction Center
Execllant site for watching space wqeather conditions.
Propagation Resource Center :: NW7US :: HFRadio.org
Execllant site for propagation resources.
DX Sherlock 1.7 - V-UHF QSO real time maps
Execllant site for watching real time 10 meter and up Spots.
William Hepburn's Worldwide Tropospheric Ducting Forecasts
Good site for VHF Tropo Propagation.