Creating Solutions for SharePoint 2007

Here is a good article on Creation "Solutions" for SharePoint 2007 by Gustavo Velez

Team-Based Development in Microsoft Office SharePoint Server 2007

Summary: Learn to properly conduct team-environment development of Microsoft Office SharePoint Server 2007 sites and assemblies (Web Parts, site templates, custom list templates), as well as develop Microsoft Office SharePoint Designer artifacts (master pages, workflows, CSS sheets). (13 printed pages)

Eric Charran, Microsoft Corporation
April 2007

If you are are a MCMS 2002 based developer, here is a good resources for MOSS 2007 for you

http://msdn2.microsoft.com/en-us/library/aa830819.aspx#cmso12formcms2002_channelsvssites