Today, my fellow editors and I had a heated discussion about the correct spelling of "y'all." (Side note: I have no problem with "y'all," "youse," "you guys," etc. Most languages have separate words for the singular and plural form of "you"; English doesn't, and it feels weird, so we make regional ad hoc versions.)
One editor said he spells it "ya'll." He's from the South, so I'm inclined to respect his opinion. On the other hand, this is the same guy who mentioned "crispie crème" donuts in an email today (leading Emily to exclaim, "It's Krispiey Kreme!!!!!!!!!" [yes, these are the important issues we're working on all day at SparkNotes]).