Just a heads up if you didn't already here the announcement, but you can go get the public preview of SBS 2008 today.
What distiinguishes this public preview from the techbeta is really the location of the download and the intent. The techbeta's primary goal is and has been feedback. We are still running the techbeta. The public preview is mainly for people to evaluate and prepare for the launch and general availability of SBS 2008 in the second half of CY 2008.
We launched a new public newsgroup for SBS 2008 as well. Go to http://connect.microsoft.com/sbs08 for more details on the public newsgroup.