Ah - the Squeezebox bug has bitten you! (better than a giant weta bite!)
I'll check out the internet music streaming with the PC off tonight and let you know.
I didn't realize I could get the spiffy remote separately... Hmmm. (My friend recently upgraded to the Duet, and his SB 3.0 might also be available for sale, if I decide to keep mine.)
Receivers: In your office, you'd need an amplifier and a pair of speakers, and then you could get a second SB receiver and plug it into that amp. But the Squeezebox has to have an amplifier and speakers to plug into - think of it like another audio source, like a CD player.
This is so diverting - I was obsessed with it all in November and December. It's even easier to spend money on audio stuff than on bike stuff (especially in the winter!)
Keep calm and carry on...