The main changes in the rules for this season are an extension to the flight entry period and a new way to declare flights. See all the rule changes here.
Important: The SMS number, email address and message format have changed for declaring flights. The old system will still work but will gradually be phased out.
Some tracklogs for 2005-2009 are unavailable because they have not been transferred to the current system. These are in the process of being updated but it may take some time.