If you’re on Twitter, here’s a Spotify group using Twitter’s List feature (also embedded as a widget at the bottom of this page). This list follows the most useful and interesting Spotify-related tweeters, including:
listdj, spotibot, freshspotify, SpotifyLinks, onthespotify, areyouspotified, SpotifyFM, newspotifyalbum, and the official Spotify tweets. Oh, and you get my tweets too!
Also check out Who To Follow on Twitter for Spotify Users.