JHelioviewer is visualization software that enables everyone, anywhere to explore the Sun. Developed as part of the ESA/NASA Helioviewer Project, it provides a desktop program that enables users to call up images of the Sun from the past 15 years. More than a million images from SOHO can already be accessed, and new images from NASAs Solar Dynamics Observatory are being added every day.
JHelioviewer Download Page
SOHO JHelioviewer Press Release
Check it out.