Both XM and Sirius radio are changing their channel line-up on 5/4/11.
Here is a pdf file from XM with the new XM channel line-up:
http://www.siriusxm.com/pdf/11-1524_XM_WebLUs_5_4.pdf
Here is a pdf from Sirius with the new Sirius channel line-up:
http://www.siriusxm.com/pdf/11-1524_SIR_WebLUs_5_4.pdf