There are a few more places on the Interwebs, where I am active...
My professional network: Walter Jenner
I am an active contributor to the Drupal Open Source CMS. See my profile.
My profile on last.fm where I discover new music: Valderama
I am using this uber-trendy microblogging thingy to spread links and quotes regarding my professional interest: Valderama
The aggregation of all my online streams plus some extras: Valderama
My scientific reference collection: Valderama