An anonymous reader writes "Hot on the heels of the closure of Newzbin2, this morning the usenet NZB indexing website NZBMatrix closed shop in the face of another DMCA notice. NZBMatrix allowed users to sift through messy usenet groups and quickly find data for download. NZBMatrix's API allowed automated polling from various clients, making it one of the more popular NZB sites. This is one of the last public NZB indexing sites, leaving mostly invite-only underground sites. A sad day for usenet users everywhere."