The imagery for Vilonia, AR is available on the GeoStor ftp site http://goo.gl/dEDPf
filename = 20110428-ViloniaAR (this is a Mr.Sid mosiac). The tiff files are available in the tiffs folder http://goo.gl/LNpSX.
NOTE: All tiff files will be removed from the ftp site on Friday May 6, 2011. Please retrieve the tiff files prior to then if you would like to use them. The MrSid image will remain on the ftp site.