PARENTS & FRIENDS of LESBIANS & GAYS  (PFLAG)
PFLAG is a national organization that offers assistance to the parents of lesbians & gays.  Uh, transgenders too.  They have support groups and various educational activities.  There are 3 chapters in the Denver Metro Area:

PFLAG Denver     http://www.pflagdenver.org/       Phone:   303-333-0286
They meet on the 1st Thursday of each month @ Montview Presbyterian Church, Montview Blvd & Dalhia Street,  Denver.

PPFLAG Boulder   http://www.pflagboulder.org/
POC is Melissa Druckman at: mellowhellow@googlemail.com  Phone:  (720) 299-1453.
They meet on the 3rd thursday of every month at the First United Methodist Church of Boulder, 1421 Spruce Street. Programs begin at 7:00pm and support groups follow at 8:30pm.

PFLAG Littleton          http://pflag-littleton.org/
They meet on the 2nd thursday of each month @ 7:00 PM - Columbine Unitarian Universalist Church, 6724 S Webster St, Littleton, 80128

TransAction Support Group
Phone:  Camilla is the TransAction manager @ 720-436-1132.
TransAction is a component of It Takes A Village;  a primary focus is medical, social & financial support for victims of HIV & other sexually transmitted diseases--along with prevention for same.  However they provide a wide range of services in all areas.  Their meetings are every Wednesday @ 6 PM to 8 PM at 1477 Lima Street, Aurora. Dinner is provided.  They're open for walk-in's on any weekday from 9 AM to 5 PM.
Website: http://www.ittakesavillagecolorado.org/

The Two-Spirit Society of Denver
Phone:  720-261-1854       Fax 303-722-9836
For First Nation (Native American) GLBT's.  Activities are held throughout the year.  Meetings are on the 1st Monday of each month at the GLBT Center, 1050 Broadway, Denver
Website:  http://www.denvertwospirit.com/

Auraria Campus GLBT Student Services
Phone: 303-556-6333     FAX: 303-556-3896
Serves the GLBT Community in University of Colorado, Denver & Health Sciences Center;  Metropolitan State College of Denver; and the Community College of Denver.  Located in Tivoli Student Union #213.  Hours are Monday thru Friday, 9:00 AM - 5:00 PM 
Website:  http://www.glbtss.org/          Email:   info@glbtss.org

University of Colorado (Boulder) GLBT Resource Center

Open Monday to Friday from 9 AM to 5 PM except on University Holidays.   Phone:   303-492-1377

Located in Willard 227 

Email glbtrc@colorado.edu            website:  http://www.colorado.edu/glbtrc/

Denver University Queer Straight Alliance (QSA)
Meetings are every Monday @ 6 PM in Room 1880 behind Jazzmans Cafe
Website:   http://www.du.edu/orgs/qsa/