SharePoint 2007: Favourite Links

SharePoint Design - Master Pages and default pages
http://sharingpoint.blogspot.com/2006/06/extreme-sharepoint-design-_115108192207171602.html

SharePoint 2007 SiteGroups - part 1 - the basics
http://www.sharepointblogs.com/tonstegeman/archive/2006/10/14/13889.aspx

Blogs I found useful:
http://www.sharepointblogs.com
http://www.sharepointblogs.com/helloitsliam/
http://www.sharepointblogs.com/vandest/
http://msmvps.com/blogs/shane/
http://weblogs.asp.net/jan/default.aspx
http://blog.u2u.info/DottextWeb/patrick/
http://weblogs.asp.net/soever/default.aspx
http://www.sharepoint-tips.com/ (includes nice utility pack)

SharePoint Technet :
http://technet2.microsoft.com/Office/en-us/library/63bb092a-00fe-45ff-a4b8-d8be998d1a3c1033.mspx?mfr=true

Content Types:
http://blogs.msdn.com/martinkearn/archive/2006/03/27/561809.aspx
http://www.msd2d.com/content/tip_viewitem_03.aspx?id=d5fd9392-25e3-4771-b563-b25fceb55c52

Navigation:
Part 1: http://weblogs.asp.net/soever/archive/2006/05/31/SharePoint-2007-navigation-dissected-_1320_-part-1.aspx
Part 2:
http://weblogs.asp.net/soever/archive/2006/07/24/SharePoint-2007-navigation-_2D00_-part-2.aspx
Part 3:
http://weblogs.asp.net/soever/archive/2006/07/27/SharePoint-2007-Navigation-_2D00_-part-3.aspx

Features:
http://sharethispoint.com/archive/2006/07/17/11.aspx
http://www.sharepointblogs.com/files/97/tbaginski/entry8420.aspx (Feature Manager)

How to: Add a Recurring Event to Lists on Multiple Sites
http://msdn2.microsoft.com/en-us/library/ms434156.aspx

Customising the Site Directory in MOSS 2007
http://glenc.wordpress.com/2006/07/23/customizing-the-site-directory-in-moss-2007/

User Profiles and Audience Targeting in SharePoint 2007
http://www.developer.com/net/net/article.php/11087_3659776_1

SharePoint Folders (including Logs)
http://blogs.vertigosoftware.com/ericc/archive/2006/09/13/SharePoint_2007_Folders.aspx