Expat Explorer [hsbc.com] provides a visual overview of how 25 countries are ranked according to the opinions of those best placed to compare the quality of living in different countries: people living abroad.
The interactive, geo-located bubble world map is based on a large survey of about 4,000 expats conducted in 2010. Individual criteria can be selected under the broad categories of economic wellbeing, lifestyle/experience and the wellbeing of children to contrast the performance of different countries. Pairs of countries can be compared side by side in detail (through a bar graph ranking...: anyone wants to comment on this?), in addition to some links to relevant information such as specific tax and country guides.