Latest Ionogram.
QRZ.com Callsign Database
SOLAR CYCLE 24.COM (All of your solar needs in one place! by VE3EN)
Prediction
Solar Flux 45 Day Forecast
QTH on Map
Ham Radio Cluster
DX Spots by Radio Arcala
WebSDR on 20m/40m/80m (University of Twente, The Netherlands)
WebSDR on 20m/40m/80m (Bucharest, Romania)
WebSDR.org - List of Web SDR Sites

Images from the SOHO (Solar and Heliosperic Observatory) web page.

Current activity from HRDLOG.net web page.