You're at a friends house and you don't have any cables handy to connect up to the stereo...
This is where a FM Transmitter for the iPod is most useful.
Simply plug it in to the bottom (or top) of your iPod, and it'll turn your lovely tunes into a sqwiggly little waveform that travels through the air at lightspeed, arriving at your favourite stereo in the form of a FM Channel.
iPod FM Transmitters come in a range of sizes, colours, and prices. You'll find an assortment of them for sale below.
MONSTER ICARPLAY WIRELESS 800 FM TRANSMI...
VECTOR VEC431 CHARGING DOCK FM TRANSMITT...
NIB MOBILE SPEC FM TRANSMITTER IPOD IPHO...
XTREMEMAC IPV APV 00 AIRPLAY BOOST FM TR...
GIGAWARE 12 495 FM TRANSMITTER FOR IPOD
IPOD NANO 5 JBL MICRO 3 SOUND DOCK ITRI...