So much ado is being made about Kraken in the press with people speculating this bot is bigger than storm - which was already terribly over-hyped in terms of numbers by the press.
If you're curious - here's our AV team's write-up on it here: http://www.microsoft.com/security/portal/Entry.aspx?ThreatId=-2147369263 and here: http://www.microsoft.com/security/portal/Entry.aspx?ThreatId=-2147368536

Our next Security Intelligence Report summarizing the last half of 2007 comes out real soon . . . I bet it will be a good read. :)