In rough chronological order (see also 2008, 2009, and 2010):
Norway; went numerous times throughout the year to Oslo, where I have an actual office at Opera, Sunday goes by Taco Sunday, Tuesday by Tirsdagspils, and where a lot of awesome colleagues and friends are at.
Sweden; to Stockholm with Matijs, Krijn, and Sander to team up with Robert and Jake. Linköping to see Arjan and meet the rest of my team (Opera has an office there).
Colombia, Peru, Bolivia, Argentina, and Uruguay; awesome backpacking for three months with Peter and Tom.
Germany; flew from Oslo to Berlin to party with Michael and Ermin.
United States; Seattle for the CSS and SVG meetings. Months later I went to Santa Clara and San Francisco for TPAC.
Austria and Italy; two nice short hiking trips in the summer. Also road trips, in a way. One with Dion and one with my dad.
Japan; met up with Mike in Tokyo to do some work, visit sentō, and enjoy the mountains.
United Kingdom; relaxed in London for a weekend with Stefanie and Peter.