"In the States, I've heard from users in NYC, Chicago,
and San Francisco. They all report that Google searches were
running at historically low speeds. I've heard similar reports from
users Europe and Australia.
"...This leads me to conjecture that what's happening is a
massive DDoS (Distributed Denial of Service) attack. Based on the
size of the attack that would be needed to interfere with Google, I
believe that it's quite likely to be the result of an attack from
the controllers of the Windows worm, Conficker."