Scoble pointed to this AP article that says the next Blaster (really a tool that exploits a similar vulnerability) is being distributed from China. I wonder if it’s the same as this warning from Symantec. Either way, looks like a busy day at Microsoft.com.
As always, protect yourself. The Protect site on Microsoft.com makes it easier than ever—there’s a step by step wizard for each OS, and on Windows XP you can use a Windows Update-like client to set up your firewall for you.