Normally I wouldn't link to something like this, but it doesn't appear that this site is designed to make money.
There's a movement to commit to unconditional support of Alex Rodriguez this year, with the interest of the Yankees in mind. It's called Project A13. It makes sense to me - booing certainly has not been shown to motivate A-Rod. Cheering him no matter what can only help.
Of course, you can't really convince all Yankees fans to adhere to it.