ATV Blog - Reporting on ATV missions to the ISS
Rosetta Blog - Covering Rosetta's ten-year comet journey
Mars Express Blog - Interplanetary science from the Red Planet
VMC - the Mars Webcam - An ordinary camera in an extraordinary place!
Raumzeit Podcast - Space podcast series produced in cooperation with the German Aerospace Center (in German)
(no longer updated but great information)
Thomas Reiter EVA Blog - Real-time coverage of ESA astronaut Thomas Reiter's 2006 spacewalk during Europe's first long-duration mission to the ISS