We already have a topic on season 4, but as I'm halfway through season 2 right now...
This series ROCKS. It has totally kept my attention and been interesting and fun and somewhat surprising the way through. I really enjoy the main actor (Michael C. Hall), as I first saw him in "Six Feet Under." He's playing his role fantastically in the series so far, walking the fine line between creepy as all hell and endearing. The episodes are pretty interesting; somewhat predictable at times, but fantastic lines keep me laughing even as dismemberment occurs. It can be a gruesome and at times overly sexual show uncensored, but it totally worth watching. Surfthechannel.com has some great mirrors to stream it (I recommend Megavideo once a day, or Tudou after if you can handle subtitles).
Highly recommended. Long story short, it's a show about a serial killer who kills killers and tries to fit in to normal society. That does not NEARLY do it justice, however.