Then consider taking this survey on group blogging that my friends down under developed. They will be presenting the results at the VALA2008 Conference. The survey looks at motivations for contributing to a group blog, getting started, and how you keep it going. Considering that well over 200 people in the Survey of the Biblioblogosphere stated that they contributed to collaborative blogs, they should get a great survey sample.
Hurry! The survey is only open a few more days!