A guide to the coming mobilisation against the summit of the EU bosses in Thessaloniki (Greece):

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"Action Salonika 2003"
 http://www.action-salonika2003.org
(Greek Communist Party / Stalinists)
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"Antiauthoritarian Movement Salonika 2003"
 http://www.resistance2003.gr
(Anarchists /anti-authoritarians / libertarians)
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"Initiative Genoa 2001"
 http://users.otenet.gr/~jspg/
(Socialist Workers Party / trotskyists / globalise resistance type)
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"Greek Social Forum"
 http://www.socialforum.gr/
(Synaspismos Party / socialists)
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"Struggle Initiative Thessaloniki 2003"
 http://www.thessaloniki2003.gr
(NAR / leftists)
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"Thessaloniki Resistance 2003"
 http://www.thessalonikiresist2003.gr
(anti-EU & anti-imperialist groups/ leftists)
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PS: Going to Greece you will find more organisations and groups participating in the protests than the ones mentioned above, but I don't mention them as they haven't organised themselves and they haven't published any calls/declarations against the EU summit.