I'm wondering if technology exists yet for a walkman/ipod style of
satellite radio?  Meaning that the receiver would not have to be
docked in order to work.  My understanding is that a receiver can be
docked in a car or through a home kit, but I couldn't neccessarily
pick up the receiver and bring it to a restaurant and continue
listening, for example.  Is this correct?  I thought I did hear that
technology was evolving for my example to work in the near future. 
Any further information or verification would be desired.  Thanks.

Try 

http://www.xmradio.com/myfi/index.jsp

tim

Ah ha.  Interesting.  Exactly what I was talking about.  Guess it is
not yet available for Sirrius.  Thanks for the information...my search
was limited to Sirrius which is why I did not come up with this info. 
appreciate it.