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I have always loved wikis, simply because they bring together a group of people to share knowledge and ideas.

I think a wiki for a library would be a good way to have conversations between the staff. Say you have a children's event about dragons. You could put something up to ask for ideas. Someone could add links to dragon mythology sites (which you could then tag on delicious for the kids to enjoy, too) Or someone might say "hmm, I saw a good medieval craft site for a dragon mask" and link that, so now you have a craft to do just by throwing out ideas and having people chime in.

You could set up a wiki for the Friends of the library to communicate and share ideas and organize book sales. Or the genealogy group could share their favorite links, strategies and ideas for searching online or off. You could have a local history page where you can post reminisces from older patrons about days gone by, with scans of old postcards and photos all shared by the community for today's youth and such to enjoy.