http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=270448172006&ssPageName=STRK:MEWNX:IT#ht_3766wt_941
I ordered one of these and it arrived today, I am very impressed, the Remote fully controls the Iphone/Touch, with the short Power connector it fits perfectly.
You can use either a 3.5mm jack on it to your stereo or it has a built in FM transmitter. Also has side mounted on/off switch and volume controls. Only prob is that Fag lighter/power socket goes out when ignition removed.
Comparable items from Apple Store are around £45.
Sound quality is good as is build quality and it works as required