Signalex USB charging kit consists of 3 separate short USB leads, USB one end, the other end is:
iPod/iPad/iPhone dock connector
They are super-short (about 10cm length total) which is actually a pretty cool idea for people charging off laptops or travelling a lot - combine this with a USB mains and/or car charger (PoundLand seem to do a twin unit for a £1) for maximum benefit! One of my 'friends' paid £6 for a single 10cm iPod charging cable last month!
I can also confirm that they not only charge but also sync (I can see why this would confuse some people, it might be assumed that only the power pins are connected) - also, even better, the iPod lead has a deep enough connector it can sync iPods and iPhones in their cases (even the Bumper case for the iPhone 4).
All stores seem to have lots of stock and this is definitely a bargain, I bought 3 sets just so I can leave them around the place! A normal mini/micro-USB lead normally sets you back a few quid these days, so a 3-pack for £1 is great - I know not everyone will like short leads but personally I really like the idea, less tangle and less mess!