My main fields of action in Ubuntu are:
 - German translations (l10n and i18n) and German translation bug management
 - Developing and coordinating standard translations across distributions
 - Communicating simple l10n and i18n issues to upstream
 - German Translation support: http://forum.ubuntuusers.de/forum/lokalisierung/
 - Wiki maintenance: https://wiki.ubuntu.com/UbuntuGermanTranslators/
 - General bug reporting

You can also bug me (within the Open Source community) about:
 - PHP coding jobs & MySQL database development
 - Webdesign, text layout, content management
 - Graphics and design
 - Fixing simple program bugs
 - Sketching visionary projects & project management with an eye for detail/perfection
 - Mediating (social skills) and bug reporting across distributions
 - IT consulting, security fixes
 - Encryption, privacy, VoIP and messaging
 - …