Originally published in Magknits, this pattern can now be found in English on the Strickanleitungen website.
To find the pattern, go to archive.org and in the search box type magknits.com, then go to year 2007 and double click any dates in October. Then click patterns on the upper left of the page and the pattern is at the bottom. Click on it and it’s there. Archived Magknits version, in English.
This pattern (in German called “Regenbogensocken”) is also available (in German only) on the designer’s website.
Update The pattern has now been translated to English on the designer’s website.