Hi again.
This morning I tried Arduino IDE 1.0.1 and guess what ... yep:
'byte dns []' redeclared as different kind of symbol'
So, it must be something with Arduino IDE 1.0.1, but I don't know what. I'll try to figure it out, bur for now, you beter use Arduino IDE 1.0.0 http://arduino.googlecode.com/files/arduino-1.0-windows.zip