I was just checking digg when i saw these ads at the top bar:
Well, just a small glitch I guess - but probably could be somewhat crucial to the advertiser, who would like his chosen keyword appear in the ad, which is obviously filtered by Digg to this specific page.
Or maybe it's left there intentionally, as a new copyrighting method to generate interest among professionals? Hard guess...
Wonder if anyone caught a similar ad on digg? post here if you have :)