I found a number of Yvonne's roles and other appearances on youtube and hulu.
I've added * ratings to indicate the size of Yvonne's role, the overall quality of the episode or movie, and the image quality of the video.
Batgirl Pilot ****
Before season 3 of Batman, to introduce the Batgirl character to network affiliates, a short promotional pilot was filmed. This was the first time Yvonne portrayed Batgirl. Note the costume is slightly different.
Batgirl Equal Pay Public Service Announcement ****
In 1974, Yvonne Craig agreed to be in a Public Service Announcement put out by the U.S. Department of Labor. The PSA was about equal pay for women. Craig played Batgirl. Burt Ward also appeared as Robin, but Adam West, trying to distance himself from his Batman role, did not, and so another actor played Batman. This was the last time Yvonne portrayed Batgirl.
Batgirl Theme Song ***
This video has clips from several of Yvonne's movies and TV shows.
Gidget (1959 film) ****
Yvonne is in the beginning of Gidget, hunting for boys on the beach.
It Happened at the World's Fair ****
Yvonne has a great scene with Elvis about 8 minutes into the movie. See Elvis chase after her.
Kissin' Cousins ***
Yvonne has a large role in this light and entertaining Elvis movie. Her first scene is about 11 minutes in.
Ski Party *
One Spy Too Many ****
Yvonne is the least dressed I've ever seen her in this film.