In response to T.W. Yates review, the complete first season of Henning Mankell's Wallander is available from Mhz Networks; for some reason Amazon is only selling the first season in three DVD segments, rather than complete.
The Music Box collection of the second season is exceptional, as well as only enhanced by the addition of Lena Endre to the cast. The only caveat comes with the direction and over-use of soft, light-diffused cinematography in the episode titled Arvet (The Heritage), which is sadly intrusive.
While I have enjoyed both Rolf Lassgård and Kenneth Branaghs'interpretations of Kurt Wallander, Krister Henriksson's characterization here remains, for me, the definitive portrayal of Mankell's world-weary detective, and the 26 episode Swedish television series the best of Wallander's appearances in film. If you are a fan of Mankell's detective in print, or Scandinavian crime dramas in general, this is not to be missed!