I've used two Logitech mice (one wireless and the other wired) both with great right clicking mouse buttons. Mighty Mouse is just not the same thing. Not sure why apple has been so reluctant to join the rest of the world on this for so long...
Of course this is not a new complaint as this article from 2003, referencing an even OLDER article, illustrates:
http://macdailynews.com/index.php/weblog/comments/2231