Feb 16, 2012
There is not yet any fully documented reference related to SharePoint design patterns. Another thing what exactly are you looking out for. SharePoint has various best practices related to out of the box features, custom development, SharePoint infrastructure etc, web content management, document management etc.
It will be helpful for the community if you could be more specific with your question. In the meantime please do search Microsoft technet, it has a wealth of information on most of the aspects of SharePoint.