It's a bad feed, try emailing brainlogs.de tell them to fix it:
http://www.smoothouse.com/podcast/validator.php?src=http%3A%2F%2Fwww.brainlogs.de%2Fblogs%2Frss.php%3FblogId%3D7%26profile%3Drss20
Sergei Shevlyagin, Zune Client Program Manager ~ This posting is provided as-is with no warranties, and confers no rights.