I've recently fallen in love with a museum blog. I'm finding that we have a lot of overlapping issues, both in terms of our business model (not "visitors=sales=money", but "visitors=stats=convincing people=money) and in terms of our goals and struggles - stay relevent, get people through the doors, engage younger people, get people interested in you and talking about you.
Here's a post I loved about interactivity:
and another post about how to create a successful interactive element:
I think these ideas have a lot of potential applicability in libraries, especially when working with teens. Because one of the major struggles of adolescence is finding and expressing your identity, teens tend to like being encouraged to express themselves. Temporary or permanent interactive displays would be a great way to get teens engaged with the library.