So what is Haystack? A social discovery network for music and music only. We took the best elements of social media optimization (think digg or del.icio.us) and built it upon a community of listeners and artists. We also have a group of users, called Tastemakers, who are established authorities on music.
From the Haystack FAQ:
Tastemakers are influencers within the Haystack community and are trusted sources for music recommendations. Tastemakers can be established music experts like producers, writers or DJ’s or just friends who you look to for suggestions on “what’s next.” A great Tastemaker can bring an unheard artist to the masses, or revive a forgotten release to its glory days.The final component is a built-in library of music, where the artists and labels are compensated, using our RightsNow Media Royalty. We currently have almost a thousand major, indie, and unsigned bands and tons more will be uploaded over the next few weeks.
There are many many more features currently available, as well as in the works... but I hope you take the time to check out this early preview.
To check out my profile: http://www.haystack.com/bill
Don't believe me? Listen to what Greg Verdino at Digitas and Daily Candy have to say about Haystack.