Jim Louderback has a very nice write-up of a Denial of Service his company suffered during the holiday weekend: Revision3′s Denial of Service. Snippet:

Although I can only guess, here’s what I think really happened. Media Defender was abusing one of Revision3’s servers for their own purposes – quite without our approval. When we closed off their backdoor access, MediaDefender’s servers freaked out, and went into attack mode – much like how a petulant toddler will throw an epic tantrum if you take away an ill-gotten Oreo.

(I love the toddler theme running through the story.)