You can find more information about the registration process and discounts in this previous post. If you have any doubts, please do not heasitate to contact the GUADEC team at: registration (AT) guadec (DOT) org
Here is the link you all have been waiting for: GUADEC 2012 Registration
Before registering review the GUADEC 2012 Conference Attendee Policy
Once you've registered, why not display the GUADEC blog badge?