I just got my February 2013 Fine Woodworking magazine and they were talking about fitting tenons. It was a good article, but I do something a little different (not necessarily better) at least for the tenon cheeks. Their fitting involves using a shoulder plane for the shoulder and a skewed rabbet plane for the cheeks.
Chris Schwarz talks about it a bit here (since I can’t share the FW article).
So for what it’s worth, here’s the way I do it.
sheworkswood.com 