(We already have PDF versions accessible this way.)
It could also provide the basis for keeping backup sites
up to date. Rather than having someone upload the whole
78MB of full snapshot file, they could simply update
their local copy by doing a bunch of "wget
http://planetmath.org/canonicalname/xml"'s. Given that
we already have "New in Encyclopedia" and "Latest
Revisions" on the website, all that would be needed would
be to output that data in the form of a daily list of
canonical names.