The hardest part is getting developers to use your wiki. I have some long standing suggestions here: http://possibility.com/wiki/index.php?title=GettingYourWikiAdopted
Getting a Wiki Adopted is Tough
Have a Champion
Remove Objections
Create Content
Enmesh the Wiki In Company Processes
Evangelize
Don't Give Up
Consider Not Using Wiki For Conversations
Just Do It! Don't Wait For a Budget
Have a Transition Plan
Promoting Your Wiki
One good practice is to have the entire documentation and source code for each build available through your wiki. Then developers will go to wiki to access build info and that makes it invaluable.
