Classified by CW MCall for a classifieds service… or better yet, a “revitalization” ad campaign for Craig’s List after their recent knocks from bad press. I can also see it being used for EBay, or a Car dealership, in a comparative negative of the superiority of their service against local competitors.
“Ring of Fire” for Preparation H. The makers of Preparation H actually wanted to use his song in a commercial, but his daughter refused to let them use it.
Ooooh another one! “High Speed Dirt” by Megadeth selling airline tickets.
I mean, people think Craig’s list is so magical because it’s digital… Craig’s list has always been with us… this is the analog. Really a lot of the computer social problems of today were all covered during the CB heydey of CW McCall. Ain’t nothin new.
The Buzzcocks “Ever Fallen in Love With Someone? (You Shouldn’t Fall in Love with)” for one of those late night divorce lawyers/or reeducation churches.
Simon & Garfunkel - “My Little Town” - Fisher Price Little People playset
Marcy Playground’s “I Want Sex and Candy” for candy. And sex.
The Beatles’ “Taxman” for H&R Block. (Actually I wouldn’t be surprised to learn some accounting firm is already using it – or will once the Michael Jackson estate, which as I understand it still owns the rights to a lot of Beatles material, is entirely settled.)
Oingo Boingo’s “Little Girls” for the Girls Scouts of America.
It’s already happened. In fact, I think it was H&R Block or some other national accounting service that did use it.
The Beatles’ “Maxwell’s Silver Hammer” to sell hammers.
During a long car ride a few years ago, my wife and I fiddled around with writing some parody lyrics for this. Of course, we promptly forgot all but the chorus:
She don’t like
She don’t like
She don’t like
Rogaine
Eeeeew. 
While they were still alive, my ad agency did get permission, from Johnny and June (who wrote it), to use “Ring of Fire” in a restaurant ad (specifically touting some fire-grilled items). They were actually quite gracious, and, after seeing the ad on the air (it used Johnny’s recording of the song, but a female voice-over artist to talk about the food), Johnny volunteered to re-record the voice-over part.
AC/DC’s “Dirty Deeds Done Dirt Cheap” for Blackwater/Xe.
I win the thread. 
Jimmy Buffett’s “Why Don’t We Get Drunk and Screw” for . . . a hardware store. Yeah, that’s it. A hardware store.
Tori Amos’ *Me and a Gun *for Smith & Wesson.
I’ve marveled for a while now that the pharmaceutical companies haven’t gotten Barry Manilow’s Tryin’ To Get The Feeling Again for Viagra/Cialis, etc.
“Doctor, My woman is comin’ back home late today
Could you maybe give me somethin’?
'Cuz the feeling is gone and I must get it back right away. . .”
Actually took a run at this a few years back. (Un)fortunately, I’ve forgotten most of it. Here’s a surviving fragment:
If your friends call you Slick
You’d better get some quick, Rogaine
Puts a mane
On Your brain
If you’re vain
Rogaine
[ul]
[li]“Smells Like Teen Spirit” for, what else, Teen Spirit deodorant.[/li][li]“Wipeout” for any brand of toilet paper.[/li][li]Dream Academy’s “Life in a Northern Town” by any tourism agency representing Canada, Alaska, etc.[/li][li]Kiss’ “Love Gun” to sell condoms.[/li][li]Tori Amos’ “Cornflake Girl” for Corn Flakes.[/li][/ul]