From a backstory in the issue.

Sadie, Starman's love interest, has been kidnapped by his nemesis, the Shade. She is bound wrists in front and has a cleave gag in her mouth. Source: Comics 101

The Bride, the villainous of this storyline, kidnaps young women and kills them to steal their youth. At one point, we see that the Bride has one of her future victims tied up in a closet with her mouth taped shut. The poor girl is later killed offscreen. Source: Rokk's Comic Revolution

An agent named Brooke is knocked out briefly.

An agent named Scarlet is electrocuted by a trick remote. And while she doesn't pass out, in the next issue she is tied to some toy railroad tracks.

Black Terror and his sidekick get chloroformed. Their female friend is kidnapped and bound and gagged as well (briefly).

Black Terror (in his alter ego) is chloroformed by some thugs. His girlfriend is kidnapped while he's unconscious.

YES! A great chloro scene finally found!!!!

Some interesting scans from Black Terror #24. Issue 24 has a great bondage cover. I also liked the cover to issue 20, so I threw that in as well. There's a good bondage scene inside issue 24.

This is a different Gen13 version, don't confuse it with the other v3. Ja'Nelle is knocked out by a neck chop.

Unconscious cover.

Huntress is being restrained by her enemy. After some lecture by another villain, the enemy behind her hits her in the head. Apparently she's unconscious when they take her to the car outside, because one of them comments about her waking up later.

Black Canary is running from a couple of enemies when she thinks she meets Superman, Batman and Mary Marvel. They however, turn out the be an imposter who knocks out Black Canary by hitting her in the face with a stick.

A nice cover of Birds of Prey - Manhunt issue 4. Black Canary is fighting Shiva while Catwoman and Huntress lie unconscious in the background.

Comissioner Amy Angotti, Ex Machina, and several other characters from the series have their mouths symbolically taped shut by Padilla, a cut throat reporter. Source: http://i.newsarama.com/preview_images/dcnew/sept09/7/exmachina_45.jpg

April O'Neil is knocked out from behind while on an archeological mission. She is tied to and alter and nearly sacrificed. Contributed by: http://s1.zetaboards.com/Everyone_In_Distress (hypermagneto999)

These are some Darna pinups I found on the net. I think they are fairly recent.

A very famous bondage cover by Alex Schomberg.

From the backpages of the issue. Published by Dark Horse.

Unconscious cover. I believe this is a one-shot. Nothing on the inside.