About 2 years ago I made the mistake of starting a large website using iso-8859-1. I now am having issues with some characters, especially when sending data to the server using ajax. Because of this, I would like to switch to using UTF-8. 

What issues do you see coming from this? I know I would have to search the site to look for characters that need to be changed from a ? to their real characters. But, are there any other risks in doing this? Has anyone done this before?