Interesting section on cyberattacks on the Wikipedia page about the ongoing Russian-Georgian war. All these websites are currently down.
South Ossetian officials stated that two Ossetian news media sites were hacked. Dmitry Medoyev, the South Ossetian secessionist envoy in Moscow, claimed that Georgia was trying to cover up reports of deaths.
The National Bank of Georgia website was defaced and replaced with a gallery of known dictators of 20th century with Saakashvili added amongst them. Georgian newsportals were under Internet denial-of-service attacks and reportedly the site of the Georgian Ministry of Defence was hacked as well. The attacks are similar in nature to the 2007 cyberattacks on Estonia and were carried out with the same techniques.
The Georgian Ministry of Foreign Affairs website was also defaced and replaced with a collage of Saakashvili and Adolf Hitler photos.
Websites of the aforementioned National Bank and Ministry of Foreign Affairs are currently offline. According to the New York Times, Georgian websites had been crashing frequently on 8 August.