Just thought I'd post this link:
http://www.myinkblog.com/2009/01/16/5-reasons-to-use-silverstripe-for-your-next-cms/
1. The Community
Simply put, the SilverStripe community is awesome. Every time I have posted a question on the forum it’s been answered within 24 hours. The community is very active and intelligent. Which should ease your mind a little about the relative obscurity and newness of this CMS...