I created a Robert Johnson Crossroad Blues and folklore site. One of the features is a variety of cover versions of Crossroad Blues by various artists. Please click on the link below to visit:

http://leep.lis.uiuc.edu/seworkspace/smolla/Rjohnsonhm.htm

and if you would like to contribute an mp3 cover of Crossroads to the site please email me at dan@dansmolla.com

thanks!!