Oh boy, how big a CanOfWorms am I opening here?
There is now a wiki for IAs -- IaWikiDotNet -- at http://www.IAwiki.net/
See Information Architects by Richard Saul Wurman, ISBN 1888001380
I've never heard of IA used to directly describe databases, and am more than a little surprised by the "glorified DBA" option above. Obviously other people have had different experiences.
There are some online resources about Information Architecture that might help to clarify the subject:
Movie Director wanting to get into "multimedia" 
Something completely different 
Web site organizer 
Data encoding system design specialist 
All of the above 
Place a 9 for "completely agree", and 0 for "entirely disagree" in each case.
Feel free to add your own categories above.
Maybe the question should be "What kind of information do we want to architect?"