These lists are culled from working with local organizations, politicians, and businesses.  If I've left someone off, I apologize, and please let me know so I can add your link.  I have links listed whenever possible.  If a person or organization is listed without a link, either they do not have an online presence, or I don't know it.  Again, any updated information on links is appreciated.

List order within each group is alphabetical, and does not imply any preference for one business or group over another.  For the most part these are gay-owned and operated businesses, or have shown themselves to be friendly to the gay community in special ways.

 
GLBT Service and Advocacy
Coalition for Adotion Rights Equality (CARE)
Eastern Michigan University Lesbian, Gay, Bisexual and Transgender Resource Center
GLSEN
HIV/AIDS Resource Center (HARC)
Prevention and direct care for people with HIV/AIDS in Washtenaw, Lenawee, Jackson, and xxxx County
Lesbian Moms Network (LMN)
Papa Dads
Parents and Friends of Lesbians and Gays (PFLAG) - Ann Arbor
also chapters downriver and detroit
Rainbow Families - Great Lakes
Sponsor of Family week is Saugatuck
Triangle
Statewide advocacy group.  Lobbying.  Hate crimes protection and advocacy.
University of Michigan Office of LGBT Affairs
Washtenaw Rainbow Action Project (WRAP)
Washtenaw County's GLBT Community Center and advocacy group 
 
Social and Interest Groups
LezRead - Ann Arbor
LezSocialize - Ann Arbor
Rainbow Reading Club
A2 Connection - Lesbian Social Group
 
Media
Ann Arbor Observer
Between The Lines
Current Magazine
Metra Magazine
Michigan Public Radio
Michigan Television
OutPost
WCBN - host of "Closets are for Clothes"
WEMU
 
Performing Arts
Ann Arbor Symphony
Blackbird Theater
Cassini Ensemble
Michigan Theater
Performance Network
Peter Sparling/Dance Gallery
University Musical Society
 
Business and Services
Action Mechanical
AV Consulting
Her Electric
SCS - Strategic Computer Solutions
 
Realtors
For some reason it seems there are a lot of gay and lesbian realtors.  Here are a few great ones:
Greg Johnson
Martin Bouma
Trillium Real Estate
 
Salons, Hairdressers, and Barbers
Michael Susanne Salon
Encore Studios
 
Employee Groups
Pfizer Rainbow Alliance
Ford GLOBE
 
Government and Politics
City of Ann Arbor
Kerrytown Ditrict Association
Rep. Chris Kolb
Washtenaw County
Rep. Tammy Baldwin - okay, she's not local...but she is lesbian AND from Wisconsin (go Badgers)