Friday I mentioned that academic articles need permanent URLs and that DOI might be the answer. Today, while looking at a column at the ACM portal, I noticed that they assign a DOI number to articles. Cool. IEEE is apparently also using them (as this link would seem to indicate), but they're not as up front about it, so its hard to tell.
The next step would be to promote the use of those in articles that the ACM publishes. Rather than a PDF, I'd rather have an HTML document with the references linked (via their DOI) directly to reference instead of a dead link to the bibliography.