As you might have read in the blogs of some of the guys from the p&p team or at Codeplex, the Prism survey is a place where you can share your thoughts, experiences, feedback (both good and bad) about using the guidance (both WPF and WPF & Silverlight versions).
Your feedback is important to improve the guidance for the next release so please, take some time (should take about 10 minutes) to fill the survey.
If you currently believe that something is a must for the next version of Prism, you can contact Blaine Wastell, p&p Program Manager, by e-mail or through a comment in this post.