According to a press release by the Openbaar Ministerie (the Public Prosecution Office), a dutch man with the initials SK has been arrested in Spain (English translation) for the dDOS attacks on Spamhaus. Authorities in Spain have searched the house where SK was staying and seized electronic devices including computers and mobile phones.
Brian Krebs has more, including multiple sources that identify SK as Sven Olaf Kamphuis. Sven Olaf Kamphuis was quoted in many articles about the dDOS, including the NY Times and various reports by Ken Magill.
ETA: Spamhaus thanks the LEOs involved in the arrest.
Arrest made in Spamhaus dDOS
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Good news, this. And I think we can be fairly certain that this is, indeed, Sven Olaf Kamphuis.
(I think the correct spelling is “DDoS”, btw: Distributed Denial-of-Service.)
I’ve seen it as distributed Denial-of-Service, hence the lower case d.