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[Phil Pennock]

RFC 4880 5.2.3.20. Policy URI (subpacket type 26).

That holds a URL which contains a policy statement about how the identity was verified or whatever else the signer deems relevant.

By way of example, my two signatures on this key have a very relevant policy statement which provides relevant information about the security of the key being signed:

  http://keyserver.gazzang.net/pks/lookup?op=vindex&search=0xed914eb03e5983fee6ede8b8c69c3bc010b2b1f3

By contrast, SKS does list them, entitled "Policy URL":

  http://sks.spodhuis.org:11371/pks/lookup?op=vindex&search=0xC69C3BC010B2B1F3

I have other signatures which don't have the .txt extension and no guarantees can be provided, it's just a link to more information.

Minimally, Hockeypuck should do the same as SKS, including linkifying the URL. To be fancy, there could also be a button which uses Javascript to tack a new iframe into the current page, rendering the URL's content in a viewing window, or somesuch, with whatever security constraints are needed to protect against malicious iframe targets.