You can find the most recent Power Rankings by clicking here for player and here for guild.
The Power ranking system is designed to give a more reliable system of balance of nations. It is still a work in progress.
Power Rankings work by looking at multiple factors including the kills of players from that nation and the classes. It uses some maths to generate a set of numbers that then decides where you fit on the ranking. Currently the system effects:
The buffs available from Lilola Hawn - these change depend on your ranking. Weaker nations get better buffs. Remember Lilola can be found in all Dungeons, Karena and Traband as well as Regenshein.
The 'free' exile system. When a nation is deemed weaker than the others a special exile merchant will be opened to allow exiles.