The Global Corruption Report. (Exactly what it says on the tin) is available free from http://www.globalcorruptionreport.org/ as a .PDF file. Transparency International site at http://www.transparency.org/
You can also download extracts.
The Global Corruption Report is an annual evaluation of the state of corruption around the world, published by Transparency International, the world’s leading anti-corruption NGO. Drawing together analyses from journalists and experts, the report presents recent developments in both corruption and the fight against it.
FYI Ireland has dropped from #18 to #23, which according to TI, while not entirely the end of the world, certainly isn't a Good Thing.