For more information you can catch up with Planck on the mission blog on Planck's twitter, and on the Planck outreach website.
I help maintain the blog and work on both the Planck and Herschel missions.
Bias settings for the detectors, calibration, temperatures for the various cooling elements... There's a whole lot of things that need to be sorted out in the commissioning and 'performance verification' phases, and this is what we're spending the time between now and the first full-scale science observations in mid-October.
"More software projects have gone awry for lack of calendar time than for all other causes combined." -- Fred Brooks, Jr., _The Mythical Man Month_