I haven't heard of any such incidents in Atlanta, but we had something like that here in Raleigh: Legendary classic-rock DJ Bob the Blade, of WRDU, did so a few months ago, almost two months after WRDU flipped to country as "106.1 The Rooster" (Clear Channel strikes again!) When the flip first happened, all the old DJs, including The Blade, left then, but a few weeks later he returned to his old afternoon-drive slot on The Rooster, then abruptly quit near the end of his shift a week later, saying he could never be a country DJ. He has since joined another classic-rock station east of Raleigh.
I'm curious about one thing: Was the Boston DJ who quit on the air from a Clear Channel station? With the possible exception of the flip of soft-rocker WRSN "Sunny 93.9" to rhythmic AC as WKSL "93.9 Kiss FM" after this past Christmas, Clear Channel has made a total mess of the FM dial in both Raleigh and Greensboro last year between February when Greensboro's WGBT "94.5 The Beat" went espanol as "La Preciosa 94.5" and October when WRDU died and went country as The Rooster. And speaking of country stations, during that eight-month time frame CC completely and thoroughly murdered one in Statesville (the late 105.7 WFMX) that had heritage dating back to the late 1950s. That station is now in Greensboro as WMKS "105.7 Kiss FM" (with a format that doesn't even fit the Kiss name!), and the WFMX calls were recently snatched up by a station up in Maine.