It is an Internet discussion list/listserv, like PECANS, that focuses on the practical aspects of childrens and young adult services for public libraries. People from libraries all over North America share their programming ideas, discuss issues like censorship or policy creation, collection development - or just to ask a question, such as "A patron came in trying to find a book they read when they were six, it was about...." It's a safe, helpful environment to learn and to share and I encourage everyone that is interested in developing their children's or young adult programming to join the list. Don't worry about the volume of email, there are options to manage it. And at the very most there may be 15 messages a day.
Sampling of recent topics: How to start an anime club, Titanic programs, ideas for Storybook Character Day, how to find longer "gentle reads" books, etc.
To sign up for PUBYAC, visit http://www.pubyac.org.