mudcub

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United States
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Full gay marriage
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Massachusetts (since 2004)

Civil unions fully equivalent to marriage
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Vermont (2000)
Connecticut (2005)
New Jersey (to be implemented by April 23, 2007)

Civil unions partially equivalent to marriage
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New York (1997) (only for New York City)
Hawaii (1997)
Washington, D.C. (2002)
Maine (2004)
California (2005)
Alaska (2006) (rights to partners of state employees, currently disputed)

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Worldwide
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Full gay marriage
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The Netherlands (since 2001)
Belgium (2003)
Spain (2005)
Canada (2005)
South Africa (2006)
Israel (2006) (only for marriages performed in other countries)

Civil unions fully equivalent to marriage
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Denmark (since 1989)
Norway (1993)
Sweden (1995)
Iceland (1996)
Finland (2002)

Civil unions partially equivalent to marriage
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Hungary (1996)
Greenland (1996)
France (1999) (a civil contract called the Pacs, which gives some rights but not tax rights, inheritance and adoption)
Germany (2001) ("life partnership" only gives same inheritance and tenants' rights as heterosexual married couples)
Portugal (2001)
Croatia (2003)
Argentina (2003) (excluding adoption and inheritance rights)
Luxembourg (2004) (modeled after France)
New Zealand (2005)
United Kingdom (2005) (some rights in pensions, property, social security, and housing)
Andorra (2005)
Switzerland (2005)
Brazil (2005)
The Czech Republic (2006)
Slovenia (2006)
Mexico (2006) (just for Mexico City)
Uruguay (2006)
Australia (one small region)
Italy (10 regions)

Other of note
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Taiwan (in 2007)