Via Nancy White I found his funny video talking about blogs versus wikis. It matches well with my previous post about an online community using a mailing list, with a wiki as a repository. Why? Because I have experiences with an online community using a mailing list, teleconferences and a weblog as a repository. It could have been a wiki too.
The choice between the two probably depends on personal preferences and experiences (do members have more experiences/habits of reading weblogs or working with wikis?). Stories are probably better for a blog, and frequently asked questions are more easily structured in a wiki. In the video, wikis are shown as more democratic. That might be a consideration too. Do you want a really large group to work the repository? Then a wiki might be easier than a teamblog.
Enjoy the video!