That was the scene where Salander was furnishing her apartment if I remember correctly. The apartment was presented through her very technical viewpoint and IKEA catalog.
But a couple of chapters later there is a scene when Blomkvist visits the place and the description through his POV is totally different. It shows how different these two perceive the world.
And then there was a scene (in the second book, IIRC), where there literally is a listing of products from the IKEA catalog.