That TPB sounds interesting. I have read one story that got adapted into an episode, "The Joker's Utility Belt." Although the episode added a lot more material at the beginning to flesh it out to an hour, the bulk of the story was adapted quite faithfully.
Yeah, when I first saw it in my local Forbidden Planet I thought it was to do with the Batman '66 monthly comic, but further examination revealed that it was like the Lois and Clark tpb from 20 years ago. As for the stories, some are definitely straight adaptions to the show. Others introduce characters eg Riddler, Mr Freeze and Batgirl.