Q) I Just want to understand how useful WSS 3.0 as a content management system? is it worth using wss 3.0 ?
A) There is an open source WCM available for WSS 3.0, more information here http://www.completesharepoint.net/ and http://www.codeplex.com/completesharepoint and A free Sharepoint Framework which can be used for publishing Layouts! details here http://www.spworks.co.uk/arf/default.aspx
This blog entry is kind of WSS VS MOSS and may be useful to you http://blogs.msdn.com/nijain/archive/2008/06/30/wss-as-platform-for-internet-web.aspx