The publications can be found in the numerous files stored in the Swiss Federal Archives under various categories.
Activities as Vice Chancellor – e-government activities (1991 – 2005)
A large part of the files are archived with the Federal Council’s documents. Since it was very important to inform a wider public about e-government activities, several publications were produced, see the list here: PDF.
Activities as Delegate for International Affairs (2005 – 2007)
The files / publications are publicly accessible in the Swiss Federal Archives:
Activities within the framework of the Swiss Foundation for Educational Media (SSAB / FSFA)
You can find a lot of information / publications on the archive page of the foundation: http://www.ssab-online.ch/ (German, French, Italian).