I got this Cannondale M400 (1999) from CL last week. Its the original owner, and I got all manuals and a Cannondale Video and the bikeshop receipt (BikePeddlers), even.
I was messing with adding a speedometer and spinning the front wheel and saw this:
http://www.flickr.com/photos/99019398@N00/3601507251/
Is this what you mean by a wheel needing truing?