XM vs Sirius, helpful chart
Pretty good link. If you're a Stern fan however, there's only one choice - Sirius.
http://www.radiosatellite.org/
More Internet Misinformation
It seems that even though this website was updated on sept 13, 2005 they do not have all of their facts straight.
I can only write on behalf of the misinformation on the XM side as I have look extensively into it and tried there free 3 day internet only trial. www.radiosatellite.org states on their web page that internet access is an additional $9.99 a month, however this is not true. XM online is free for all subscribers of XM Radio. If you did not own a radio and only wanted xm online it would only cost you $7.99 a month. This has been so for many months now.
There may be other info wrong on either satellite provider but my feelings are that this website was made by a Howard Stern fan as they mention them but do not mention Opie and Anthony on XM. The later were 2 DJ's that were also national syndicated and went to satellite almost 2 years before Stern will. I only mention this because if you are going to compare, compare without bias.
Greg