I sympathize. I don't know that it will make me stop reading something, but it does always make me pause for a moment. Others that I frequently see - lots of people seem to get "warily" and "wearily" mixed up. And "bare" and "bear". And it seems like even the best writers get "bemused" and "amused" mixed up. For me, it's kind of like tripping over something on the sidewalk - you're just reading happily along, and then "er, wait, that doesn't quite make sense there...what?" Maybe that's just me though. :)