[Eddie Lim] "Who is the person I should get in touch with at the broadcast station to go over all of this? "
If the station has a web site, they usually have a section for what their submission criteria is. If they don't have one, then ask the person / department that you plan to submit the work to (i.e., you must be giving it to someone and they will be handing it to someone else who checks for conformance).
[Eddie Lim] "I was also thinking... Has this whole scenario (sending a commercial in for broadcast) ever been as easy as just handing someone at the station a mp4 or wmv file and let them handle it (in terms of making the file what it needs to be for broadcast)?"
Nope. That's your responsibility. That's what a finishing editor does. If you use something to just "make it legal" you could cause all sorts of clipping that will look ugly and might cause it to be unusable for broadcast but they do have legalizers that will just clip whatever is illegal. Again, ask the station what they expect. If you want it to look the way you intended, it's best for you or a finishing editor to bring the levels and colors within legal limits and maintain the same look.
I would be very surprised if they take a file at all. Most stations are still tape based and have no idea what to do with your submission unless it's on tape.
~jr
http://www.johnrofrano.com
http://www.vasst.com 
