I have an elementary library that serves about 530 students. I think it is important to know each child's name and to greet him by name every time you see him. Equally important is to smile. It hasn't killed anyone in a school library yet ( to my knowledge).
I take kids suggestions for series I should buy. It is amazing to me that second graders know the exact date a new Magic Tree House will be released. (I sure don't!) I try to buy as many of their suggested titles as I can. I let them know that I bought a book on their recommendation. No, they don't always get what they want: I won't buy Twilight or Hunger Games for my elementary students. But I do try to accomodate their favorites.
We have afterschool book clubs for kids. The library is open for kids and their parents to come use the library about two evenings per month. For the past few summers, I have had open library nights as well,
I stress to kids beginning in kindergarten that this is THEIR library and that these books belong to all of them. This causes appropriate outrage when they see their books being mistreated!
I am in a high school with about 550 students. We are celebrating teen technology week and library week together with out annual library gaming day. our teachers sign up there classes for a 25 min block of time to come and play games in the library. It has always been a huge success. The students ask all year when are we having library gaming day?We have games of all kinds from board to video. It is a huge headache for me but the students love it.