By default, the wikis in Google Code Project Hosting are editable only
by the members of the project. There is a bit that can be flipped to
make the wikis world-writable, but then the team must be prepared for
vigilance against spam. In the case of the changelogs, the possible
user contributions wouldn't be worth the time spent moderating spam.

Anyway, I've added more links from the front page of the issue tracker
to the changelogs. I'm also thinking about adding a link from the docs
("More Resources") to the changelog.

- pamela