In Athens, around 1000 took part. They first started at the mens prison and then continued to the womens. There was a small demonstration on which some banks' ATM machines and surveillance cameras were destroyed. The 6-7 riot squads did not react.
Photos from Koridalos prison (Athens): http://athens.indymedia.org/front.php3?lang=el&article_id=958925#959017
Video: http://www.youtube.com/watch?v=kCm4EVN8R7I and some more: http://athens.indymedia.org/front.php3?lang=el&article_id=959426
Photos from Ag. Stefanos prison (Patras): http://patras.indymedia.org/front.php3?lang=el&article_id=3654#3655
At the same time, at the Sintagma square (Athens), a gathering against the bombings of the Israeli army in Gaza and the occupation in Palestine was taking place with many migrants (Palestinians and others), members of peace movements and left wing organizations and parties.
Moreover, arson and other attacks took place in many cities after midnight sending a message for 2009.
In Athens, 7 banks, 3 car dealerships, 7 cars and 15 garbage bins were set on fire.
In Thessaloniki, bank offices, and a womens' clothes store were burned. During a demonstration, 23 garbage bins (used as barricades) were burned and the police fired teargas and flash-bang. In another part of the city, municipal police cars and office were attacked and burned.
In Larissa the city's christmas tree was half-burned.
In Serres, the nationalist right-wing party offices were attacked, the windows were smashed and paints were thrown.