My random thoughts on wikis....
The library best practices wiki is pretty cool. I found a lot of useful job searching resources on it that I wish I had know about when I graduated from library school.
I think a good use for a wiki in a library--which has already been done, I know--is to provide a forum where people can talk about new materials the library is getting and post reviews of them, etc.
I like how the Bull Run Library had a section on the wiki about whether people are getting their money's worth for the $33 that the library costs each citizen.
We could probably use something like this to show how much of in-county residents' taxes go towards the library and what they get from it. We could add this to our arsenal of defenses against anger about the out-of-county card fee (I work at the MAX branch, so we have LOTS of out-of-county card confusion, ire, etc.).
I definitely see how wiki's could make a library more "2.0." They can extend the library as a gathering place or community space onto the internet. Libraries can now surpass their physical boundaries, in a sense.
