2 - Describe all the various methods and tactics by which end user
"brokenness" can be detected.  This may include website-based detection,
DNS-query-based detection, or a variety of other methods.

Suggestions: (Nick Weaver I think had one ­ pasted below)

Also, you can make an EASY in-browser Javascript check.

Load 3 images in a hidden DIV.  These images should ideally be set to be
non-cached and have a cache-buster in the URL (akin to how Google Analytic's
hidden GIF is loaded: it contains a cache-buster in the URL).

One is hosted on an IPv4 only site, one on a IPv4/IPv6 dual stack, and one
on a IPv6 only site, and bind onload/onerror to Javascript for reporting.

If the first two load, the host is a successful V4 host.

If only the first loads, the host has the described problem with a link
local V6, and needs to be patched: have the Javascript notify the user.

If only the second and third loads, the host is V6 only (HA!).
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