UI Guidelines reference

as a part of UX Process and Design process, coming with Design Guideline document is very important part. This is very important for client sign off and for dev process. This is great way to set standard and define mood of brand/application. while searching for some reference on net, got to see a great place where i can get some of the best guidelines of different companies.
love to share here -

http://www.theuxbookmark.com/2010/08/interaction-design/a-monster-list-of-ui-guidelines-style-guides/

please have a look and book mark this one