The second UK series of Wallander - the Kenneth Branagh triumph based on Henning Mankell's books - is an absolute must-see. It's even better than the first series. The noir feel of the series, though set in modern times, perfectly reflects the nordic temperament. "There's something about coming from those northern lands, you know," says Branagh, "It's a big country, small population, the seasons and the weather are extreme, and the possibility for looking inward into the interior life is great."
Nordic noir is where it's at in British bookshops at the moment. My own personal favourite is Arnaldur Indridason, featuring Inspector Erlendur of the Rekjavik police in Iceland - that's about as nordic as you can get. The late Stieg Larsson's Girl With the Dragon Tattoo series is also pretty good, though possibly a bit long-winded.
Others worth a look at are Jo Nesbo, Karin Fossum, Hakan Nesser, Johan Theorin, the fascinating Sofi Oksanen (Estonian soviet noir!) and the much underated Yrsa Sigurdardottir.
Purists might also want to look out for the Swedish Wallander series - now available on DVD - also excellent: