The Helsinki design duo Heikki Ruoho and Teemu Järvi have been working with a recycled cardboard laminate called Re-board since at least 2008, but they only launched actual product earlier this year.
Showroom Finland has apparently put the Kenno cardboard kids chair into production. And so it's all over a million design blogs. But I can't see where you can actually buy one yet.
Kenno Cardboard Furniture [showroomfinland.fi via Kenno child chair, 2011, Järvi & Ruoho [jarvi-ruoho.com]