I don't think this has been posted, but here's a little explanation for why Elder Worthlin was shaking. Apparently, he had locked knees and nothing health related...according to his son, "He's as healthy as a 90 year old can be."
As an aside, I thought that one of the more moving moments of conference was when Elder Nelson walked up to help steady Elder Worthlin...especially during a talk on charity...it was a really neat moment, IMO.
Here's a link to the story:
http://deseretnews.com/article/1,5143,695217562,00.html