Sometimes I use my blackberry for pandora (we have unlimited data on blackberries), but its not one of the sirius compatible, sadly.
I have tried a portable car reciever (i have a home dock), but no signal in my office. It would be nice to avoid the expense of another subscription, but if it came to it, I would do it. $4 a month is worth the sanity. I may be moving offices in the near future, and I would have a window there, so maybe it will work then.
My portable car receiever will actually record hours of content from 5 stations automatically. But its a bit of a hassle to use. No sirius signal in my house either, without dangling an antenna outside a window. Another reason hoping they would make the same thing but utilizing the internet.