If you can only watch one, watch Before Stonewall and After Stonewall
Other documentaries worth watching:
http://www.amazon.com/How-Survive-Plague-Peter-Staley/dp/B00A92MGLA/ref=pd_bxgy_mov_text_y
http://www.amazon.com/Vito-Charles-Russo/dp/B00A6GZV7K/ref=pd_bxgy_mov_text_z
http://www.amazon.com/Celluloid-Closet-Whoopi-Goldberg/dp/B009UYFA16/ref=pd_cp_mov_3
http://www.amazon.com/Tongues-Untied-Marlon-Riggs/dp/B00114XLZA/ref=pd_cp_mov_1
http://www.amazon.com/Out-Past-Struggle-Lesbian-America/dp/B0007SL31U/ref=pd_cp_mov_3
http://buskfilms.com/films/last-call-at-mauds/
Fictionalized accounts:
http://www.amazon.com/We-Were-Here-Ed-Wolf/dp/B006QVRVW2/ref=pd_bxgy_mov_text_y
http://www.amazon.com/Milk-Sean-Penn/dp/B001QUF3SW/ref=pd_cp_mov_2