Proposed resolution (February, 2010):

Change 13.4.3 [temp.arg.nontype] bullet 1.3 as follows:

• the address of an object or function with external linkage, including function templates and function template-ids but excluding non-static class members, expressed (ignoring parentheses) as & id-expression, except that where the & is optional may be omitted if the name refers to a function or array, or and shall be omitted if the corresponding template-parameter is a reference; or

[Drafting note: The change requiring the omission of the & in the reference case fixes an existing problem that is not related to this issue.]