Just a couple of ideas:

For naming conventions I go with the suggestions in Jamie Thomson's blog: http://consultingblogs.emc.com/jamiethomson/archive/2006/01/05/SSIS_3A00_-Suggested-Best-Practices-and-naming-conventions.aspx

You might also want to have some type of standards for auditing/logging fields on your DW tables (e.g. LastUpdatedDate, CreateDate, ETLUpdateProcess, ETLCreateProcess, ...)

Take a look at some of these SSIS best practices blogs: http://bi-polar23.blogspot.com/2007/11/ssis-best-practices-part-1.html

HTH,

Rob

Edit: Sorry, I misread and thought you were trying to define a standards document rather than create a Framework. I'd recommend taking a look at Andy Leonard's blog: http://sqlblog.com/blogs/andy_leonard/default.aspx for his ETL framework example.