Links to various research organisations and websites conducting research into the demographics of Catholicism...
NEW SCIENTIST: Who Believes What? An interesting graphic from the "God Issue" of New Scientist (March 2012) showing the numbers attracting by the major religions of the world
Original Source: www.newscientist.com/data/images/archive/2856/28562001.jpg.
String where the series was discussed on the Catholica forum: www.catholica.com.au/forum/index.php?id=97952.
AGENZIA FIDES Official Catholic Church Statistics 2010 (20Oct2010)
Original Source: www.fides.org/aree/news/newsdet.php?idnews=27635&lan=eng
CARA Center for Applied Research in the Apostolate at Georgetown University (US National and International research)
PEW FORM Pew Forum on Religion and Public Life
NCR Article by Tom Roberts in NCR with good US stats (11Oct2010)
NCR An updated article by Tom Roberts in NCR with good US stats (07Dec2010)
PPO Pastoral Projects Office of the Australian Catholic Bishops' Conference (Australian Research)
Catholic Australia Good overall statistics for the situation in Australia from this website published by Church Resources
Catholic Hierarchy Information about Catholic Bishops past and present
Sandro Magister article on Participation Rates in Italy and Europe (August 2010)
Telegraph UK Interactive map of participation rate in UK
Commonweal Excellent article by Peter Steinfels on decline in participation (22Oct2010)
National Church Life Survey November 2011 Media Release from Australian Catholic Bishops Office giving notice of NCLS to be conducted in November 2011 (01Sep2011)
www.catholica.com.au/forum/index.php?mode=thread&id=82770#p82845. That entire string is worth looking at also.
WIN-Gallup International Global Religion and Atheism Index 2012: This is a global survey conducted since 1977 showing the trends in religious belief.
CNS/NCR Report, 17 Aug 2012, which provides some insight into the official Vatican thinking in the decline in participation and the agenda for the so-called "New Evangelisation". The report is headlined: Statistically speaking: "Vatican numbers hint at fading faith practice"
Report by The Economist, 18 Aug 2012, into Catholic Church finances in America (with implications for the entire world). The report is headlined: "The Catholic church in America: Earthly concerns": www.economist.com/node/21560536
A summary of the report was also published in NCR. The NCR summary is headlined: "An Unholy Mess": ncronline.org/blogs/ncr-today/unholy-mess