Answer boards are where you'd go if you had a non routine type of question. I'm impressed by the board slamming librarian's who happily identify themselves as such.
It's really an example of what Librarians do all the time, help peole with their information requests, and it gives it a bit of web 2.0 cache on top.
We like to encourage customer feedback, right from our web catalogue, library website, blogs and paperbased forms on the checkout desks. Library 2.0 can certainly help include people more actively.