We just got a pretty detailed look at Microsoft's upcoming Dashboard update for the Xbox, which brings with it the Zune Video Marketplace and Last.fm music streaming, along with Facebook and Twitter social functionality. We were most impressed with Facebook, which includes a feature for spotting which of your Facebook friends have Xbox Live -- a great way to grow that friends list and bring a bit of "synergy" to your life. Last.fm was a bit of a downer, since you can't do anything else while listening to the music, but otherwise there weren't many minuses to the presentation other than the lack of a firm release date. Check out Joystiq's full impressions at the read link before, or watch the whole demo on mind-blowing video after the break.