i'll tell you from hitting 3.8ghz on my i7 on stock cooler, i never once checked my temps.. i live my life a 1/4 mile a time.. and for those 10 seconds or less... i'm free (haha stupid fast and furious)
yeah i never check my CPU temps (cept when im pushing a load at 1.6V or so), but i've got 4850s and its gettin hot already here so they get pretty toasty at times, so i kinda like to check up on them once in a while...