The User Forum poster session has always been on of the most lively and vibrant parts of the event. We expect this year to be no exception. 40 posters have been accepted and will be presented during the two relevant sessions, on Monday and Wednesday afternoon, in parallel with the demonstration sessions. This year the poster session offers a mixture of scientific and technical presentations on a wide variety of subjects: Grid security, distributed programming development tools, infrastructure operations and recent progress of DCI exploitation by traditional as well as nascent user communities. The attendees will have the opportunity to closely interact with the poster presenters, get informed about their recent activities, exchange ideas and potentially establish new collaborations. They will also have the chance to vote for the best poster in display. The winner will be announced during the User Forum closing plenary on Thursday morning.