if you have an S60/V70 with the cassette based HU radios - 403/603, and find ipod radio transmitters a bit pants, check out the Griffin Autopilot aux out and charger kit - 30 quid average price, charges the pod, and has line out so you can use any cassette adapter - turn your dolby off and you'll find the sound quality that bit better as well
If you feel imiv's are bit pricey - this is a good alternative...
http://www.griffintechnology.com/products/autopilot
Hope this helps someone
