I know people on here have said that they are inferior quality (personally I very much doubt it), but I bought one of these
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=250777384531&ssPageName=STRK:MEWNX:IT
It works perfectly with all the iPods and iPhone in our family and I wouldn't be surprised it it came from the same place as the items Mini / SEAT punt out for stupid amounts of money.
Well this is the one i have bought....they sent it on Monday and i've just got it!
Haven't tried it yet, but will post again once i have given it ago at lunch