The Jargon File (version 4.4.7, 29 Dec 2003):

fisking
 n.

    [blogosphere; very common] A point-by-point refutation of a blog entry or
    (especially) news story. A really stylish fisking is witty, logical,
    sarcastic and ruthlessly factual; flaming or handwaving is considered poor
    form. Named after Robert Fisk, a British journalist who was a frequent (and
    deserving) early target of such treatment. See also MiSTing, 
    anti-idiotarianism