http://blogs.msdn.com/sharepointdesigner/archive/2010/04/09/working-with-the-sharepoint-theming-engine.aspx

http://blog.drisgill.com/2010/02/microsofts-sharepoint-2010-starter.html

http://www.sdtimes.com/SPOTLIGHT_ON_2010_THE_NEW_THEMING_ENGINE/By_Randy_Drisgill/33994

http://www.brandingsharepoint.com/Lists/Posts/Post.aspx?ID=50
http://mukalian.com/blog/post/2009/12/07/SharePoint-2010-and-PowerPoint-Themes.aspx
http://makingsharepointlookgood.com/2009/07/16/sneak-peek-sharepoint-2010/
http://www.iotap.com/sp2010/Blogs/tabid/470/EntryId/162/Applying-PowerPoint-2010-themes-to-Sharepoint-2010.aspx

Sharepoint 2010 Themes vs Sharepoint 2007 themes
http://andreasglaser.net/post/2009/12/16/SharePoint-2010-themes-compared-to-SharePoint-2007-themes.aspx
How to create a Sharepoint 2010 theme
http://www.toddbaginski.com/blog/archive/2009/11/02/how-to-create-a-custom-theme-for-sharepoint-2010.aspx.aspx
Custom Sharepoint 2010 Themes
http://www.spdavid.com/post/2010/01/16/Custom-SharePoint-2010-Themes.aspx
Sharepoint 2010 Themes (from Powerpoint)
http://www.sharepointjoel.com/Lists/Posts/Post.aspx?ID=338