I love the interactive living document that can come from a wiki. Our school recently spent two years doing a curriculum map at each grade level. So much time and trees could have been saved using a wiki. We are doing our first book club next fall and I can see value and fun from using a wiki. I won't know until the new carpet is down in the library and I can get into the library but I think that a wiki site MIGHT make it pass the district firewall where a blog site never would.