I've started a pilot project to prove the value of wikis to management.
Here's a great article about increasing your chances for getting others to contribute to a wiki.
I don't like to bandy one of the "B" words around, but Stephen Downes' E-Learning 2.0 in Development and E-Learning 2.0 Why the New Tools? presentations are brilliant. Essential viewing to gain a foundation about the innovations happening in eLearning.