Below are some of my favorite websites and articles that talk about the murder of Emmett Till.
http://www.emmetttillmurder.com/
This is the most authoritative and in-depth site on the case. The author had frequent discussions with Mamie Till-Mobley and has assembled a list of people associated with the case that is exhaustive.
http://www.watson.org/~lisa/blackhistory/early-civilrights/emmett.html
One of my favorite sites for the civil rights movement. Short and concise.
http://www.pbs.org/wgbh/amex/till/
This is the site PBS created to accompany the release of the documentary “The Murder of Emmett Till.”
http://www.crimelibrary.com/notorious_murders/famous/emmett_till/index.html
This site is created by Crime Library and does a thorough job of providing an in-depth overview of the case.
http://en.wikipedia.org/wiki/Emmett_Till
The Wikipedia site has many useful links, a good summary, and informative documentation on the most recent events.