Page Layouts form the presentation layer in Publishing Sites of MOSS 2007. In fact they are very close to the Web Forms as we know them from ASP.NET except that Page Layouts in SharePoint don't contain any content.
Some time ago I have created a concept of the ContentQueryWebPart extended with paging support, called Imtech Extended ContentQueryWebPart. Since its release, the Imtech ExCQWP has been downloaded more than 200 times and some of you have sent me some questions regarding how it all works.
Did you know that you can preselect a Page Layout in the Create Page screen? To preselect a layout simply add LayoutName=YourLayout.aspx to the query string parameters:
Recently, while gathering resources for a presentation on MOSS 2007 WCM I'll be giving next week for a Dutch SharePoint community, I have stumbled upon something interesting. Did you know that MOSS 2007 is XHTML compliant out-of-the-box? Well, neither did I. But it is so, according to CMS Matrix.
Since a couple of months I've been following the SharePoint Forums @ MSDN. Most of the time I'm just checking whether there are some new questions on Web Content Management (WCM) in MOSS I could answer. Each day there are posted around 100 new questions, so you could say that SharePoint is a quite popular product and the community is really busy with it.