Excluding the bookServices web site from SharePoint manager
was a mandatory step if you were using WSS 2.0. The default in WSS 3.0 is to
exclude all sites by default. See the following snapshots to see this.
On the top tab, select application settings.
Now under the SharePoint Web Application Management group,
select the Define managed paths option.
As you can see, there is no option to EXCLUDE the web site.