Taking Asteris's advice I wrote out a protest email that you may want to copy and paste when contacting the IVG.
"To the Internet Governance Forum,
It seems that the Greek state has joined that illustrious list of enlightened regimes that feels that it can use the full force of the law to gag bloggers who have unpopular opinions. The owner of a Greek blog aggregating service www.blogme.gr is currently being sued for hosting a blog with some satirical material about a famous person. Antonis Tsiropoulos, Blogme's administrator was arrested and hauled off to the spend the night in jail and later to taken in handcuffs to the District Attorney. This is akin to arresting the owners of Technorati or Google in a midnight raid as they hosted something I disagree with.
It is a shame that the country charged with holding a conference on internet issues such as access and freedom of expression should permit the kind of draconian police action seen in the case of Antonis Tsiropoulos.
On behalf on the blogging community, both in Greece and abroad, I call upon the IGF to condemn this action in the strongest terms possible and exert all possible pressure on the Greek authorities to look into the matter."
Here is the IGF's general contact address
Here is the the IGF Greek helpline address