Bill D
In the UK we listen to radio programmes but we do write computer programs

I saw a job ad by a publishing company assk for a person to work in different mediums turned the page and another publishing company was using a slogan like Media Maestro's

gazing into my crystal ball I hit on the notion (and stiking a happy medium?) I predict that mediums will soon refer to a multiplicity of mediums and media will be the publishing/broadcasting. TV (eg) will be a media - come to think about it we are on the cusp now.
I guess it depends on whether you are media oriented or mediums orientated.