These have been circulating in the open source Twitterspere today. They struck me as apposite to discussions on these topics around MediaWiki.
How to write a roadmap:
http://blogs.gnome.org/bolsh/2011/02/07/drawing-up-a-roadmap/
How to grow your contributor community (and how to decimate it):
http://www.codesimplicity.com/post/open-source-community-simplified/
- d.