If you are subscribed to the Medlib listserv you have seen the recent chatter about shifting to only ejournals and print vs. online discussions.

Here is another article:
Electronic Full-Text Journal Articles: Convenience or Compromise
By Kathleen E. Joswick, Reference Librarian,
Leslie F. Malpass Library, Western Illinois University
T.H.E. Journal
June 2005 Web Exclusive

It is another article that looks at the promises and pitfalls of online articles. Not only are the issues of aggregators and permanence discussed, but so are patron searching patterns, the Internet, and the over abundance of information. It is not written from a medical library perspective, however it nicely illustrates all the same issue we face too.