This sounds like a really great defense of the penalty flag, except for the fact that he didn't lead with his helmet, he hit with his shoulder, into the WRs chest.
That's not illegal, it's just a great, big hit.
Of course, this is familiar ground for FSU. It was just last year when Nigel Bradham hit Laron Byrd in a similar way and was ejected immediately, only for the ACC to come out a few days later and publicly apologize for the bad call, and say that the hit was in fact legal:
http://www.youtube.com/watch?v=MGYwJaqIzLU
The funny thing is, pay attention to one of the ACC football commercials during one of their national games. Their conference highlight reels feature tons of hits like that. When they actually come during the games, they result in penalties.
ACC football: hit too hard on defense, and you'll get flagged and/or ejected! (But at least you'll receive a formal apology later in the week, and that referee crew will get suspended for a game)
Of course, if Joyner was wearing a UF, South Carolina, or LSU jersey, it's seen as a clean hit and a great example of "SEC speed!"
The ACC is seen as a bad football conference for a lot of reasons, but horrible, ticky-tack officiating on a weekly basis .