Branding your Sharepoint 2010 Site

Ref:
SharePoint 2010 Themes and Resources for Upgrading a Custom Master Page
SharePoint 2010 CSS references in Master Pages
http://technet.microsoft.com/hi-in/library/cc263203(en-us,office.14).aspx
http://styledpoint.com/blog/ribbon-customization-changing-placement-look-and-behavior/
http://blog.drisgill.com/
http://www.nonlinearcreations.com/whitepaper/index.asp?id=17
http://sharepoint.microsoft.com/blogs/GetThePoint/Lists/Categories/Category.aspx?CategoryId=16&Name=Branding
Working with the SharePoint Theming Engine

Sample:
http://www.digitalatmosphere.com.au/SitePages/Home.aspx