GlynnFoster is doing cool blogging about GUADEC.
Another blog about GUADEC and the trip of a brazilian in the Norway (in portuguese only). Here you can found a lot of pictures of GUADEC and Kristiansand.
AndrewSobala is intending to keep a GUADEC journal on the wiki (on his page at AndrewSobala) then put it somewhere more permanent later.
Fernando San Martín Woerner has a spanish blog with info about GUADEC 2004.
Keywan has a German blog about GUADEC