I know I am years behind on this post, but I thought it was just me who felt this way! I live in Tennessee and I've been hearing this prepostion now for a couple of years. It really bothers me because it's so uneccessary when speaking of the day before, the current day, or the day after. I totally disagree with "on yesterday" and "on today" and "on tomorrow." Believe it or not, I have heard all three combinations mentioned in schools, churches and the workplace. It wasn't until a reading specialist at one of the schools I tutored at finally shared her frustration, "I wish people with correct grammar would get on the intercom...and we wonder why our students struggle. Next we'll have kids saying, "Yay, I get to go to the football game on today." :)