Wikipedia URLs a Subject Codes

The link is to David Megginson's blog. This struck me as terribly interesting.
Over in my aviation weblog, I find myself more and more linking to Wikipedia whenever I’m discussing a concept, person, place, or anything else that doesn’t have its own, canonical home page. If, as I suspect, lots of other bloggers are doing the same, then links to Wikipedia articles may soon be the blogsphere’s answer to subject codes.
The idea follows something similar from James Tauber, who points to a tagging scheme from Technorati. In the end, it seems that subject identity lies in the realm of concensus or agreement; Wikipedia appears popular enough that its URLs might serve at least one important aspect of the subject identity issue.