The ARE Group - governed for a country/customer based strategy
www.are.fi/EN/AREGROUP/Pages/AreGroup.aspx

Incorporation in a tax-haven
www.iht.com/articles/2008/02/26/business/glob27.php
www.zyra.org.uk/taxhaven.htm
http://blogs.ft.com/maverecon/2008/02/blockade-the-tax-havens/

Union Carbide and the Bhopal tragedy
www.bhopal.com/
www.bhopal.org/whathappened.html
www.bhopalfacts.com

Hutchison Whampoa Limited (HWL)
www.hutchison-whampoa.com/ click on 'investor relations' then 'annual reports'
www.sourcewatch.org/index.php?title=Hutchison_Whampoa_Ltd. 
http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=731313

General Electric (GE)
As you might expect in a large and diverse company, there are a large number of GE web sites related to its many products and divisions.  To save time focus only on group level information.
www.ge.com/ (Click on 'Our company' 'Our businesses', 'Governance', and 'Investor relations')
http://investing.businessweek.com/research/stocks/people/board.asp?symbol=GE
http://finance.yahoo.com/q/pr?s=ge

The Agnelli family chain of companies
www.italia-online.co.uk/article.php/The_Agnellis
www.encyclopedia.com/topic/Agnelli.aspx

The Overseas Trust Bank case
http://query.nytimes.com/gst/fullpage.html?res=9F0CEED61438F935A25753C1A965958260
http://hk.dbs.com/en/aboutus/newsroom/2003/030721/
www.hklii.org/hk/legis/en/ord/379/

Jardine Matheson Group
www.jardines.com/ click on 'group companies' and 'shareholder facts'
www.matheson.co.uk/
www.alacrastore.com/company-snapshot/Jardine_Matheson_Holdings_Ltd-1009001

Elders IXL shareholding network
www.gabr.net.au/biogs/ABE0261b.htm
www.delisted.com.au/Company/2849/ELDERS%20IXL%20LIMITED

Carnival Corporation & plc - a dual-listed group
www.carnivalcorp.com/   (click on 'corporate governance')
http://finance.yahoo.com/q/pr?s=ccl
www.hemscott.com/companies/company-summary.do?companyId=4086
http://finance.yahoo.com/q/pr?s=CUK
http://topics.nytimes.com/top/news/business/companies/carnival-plc/index.html

The Wallenberg Group
www.iht.com/articles/1993/10/26/wally.php (1993)
www.allbusiness.com/banking-finance/financial-markets-investing-securities/7504396-1.html (1996)
www.telegraph.co.uk/finance/2936504/Why-the-Swedes-can%27t-resist-the-Wallenberg-dynasty.html (2006)
www.transnationale.org/companies/wallenberg.php