Cutting Through provides ten ways to use blogs to manageprojects:

Communicating with project stakeholders

Keeping your stakeholders up-to-date with the progress of the project is vital - but if they’re busy people with other things to worry about, how do you keep them informed between major milestone reports with bombarding them with email?

One way is to post regular intra-milestone updates to a blog. It can be updated weekly, daily or even hourly without drowning your stakeholders with emails - and if they use RSS webfeeds to keep updated, they only need to scan the webfeed summaries to know if it’s something they’ll need to respond to.

Also, four ways to use wikis for project management.