Rex, you probably know this, but a very interesting part of the Mormon Church history site is Mormon Pioneer Overland Travel, 1847-1868. It can be found at:
http://www.lds.org/churchhistory/librar ... panysearch
There are many, many names listed, and the companies they travelled with, but not the places of birth. If anyone has "lost" an ancestor in the mid-1800s it could be worth checking.
There is a Nancy Nutter Stanworth, aged 21, with her infant daughter who died enroute, aged 6 months. I was told some of my Stanworth ancestors were part of the Mormon exodus but I haven't been able to place Nancy in my tree.
Before the days of Internet accessibility I did all my research at the local LDS Centre here and it was, and still is, a wonderful resource. There are big changes in the offing, as the Church proceeds with its digitisation project.
Joan