Wiki

I quite like the idea of Wiki's - I liked the demo on how it could work for organising a camping trip and I have used one for organising a party where people had to bring a plate -  it worked very well. 

I also like the idea of using this to share information on library related issues - being able to go to one place where you know the information will be relevant.  Also it would be a great way to get staff and patrons to comment on and share particular information.