The RIAA site has a history of outages related to DDoS attacks (including extended downtime in July 2002 and January 2003) and has frequently been defaced.
Nonetheless, the ongoing traffic from MyDoom.F demonstrates that many computer owners continue to leave compromised machines unsecured and online. In theory, it should be somewhat easier for users to notice the activity of MyDoom.F, which deletes Microsoft Word and Excel documents. Yet it appears that many MyDoom.F victims soldier on, leaving the malware to continue its monthly DDoS activity.