Even the IETF distinguishes between normative refs and non-normative (though it has a penchant for wanting to redefine those words too). Private correspondence is not citable as a normative ref, nor are (currently) IDs.
IDs aren't citable in RFCs at all, so I'm not sure why you brought
that up. The distinction between normative
references is not that normative references can only be to formal
documents and informative references to more casual documents. The
distinction is role-based. Check out http://www.rfc-editor.org/policy.html#policy.refs
Put them up in a public archive and that assertion is no longer true. It becomes appropriate to use them as normative refs.
Sorry, not true.
Melinda
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