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I bought this charger from Amazon for use with my Sony Ericsson smartphone. It cost me about a fiver and came from one of those independent companies that can list on Amazon. Delivery, as usual, was quick.
The item consists of two components: the adaptor from your in car charger to USB port and a separate USB to micro USB charger cable (such as is used with your device for charging or data transfer). This is useful as it means that not only can you charge your Sony Ericsson (or indeed any other micro USB smartphone) but any other device with a USB charger (such as an iPod). Thus this one device can f you'll think many of your in car charging needs.
I travel a lot for work so this charger sees a lot of action and has yet to let me down. It features a charging light so you can check that it is plugged in cocorrectly, which can sometimes be a problem with all in car chargers. The device is easy to plug in but is a little harder to remove than others due to its small size and the fact that you cannot pull on the cable to remove it (as it will separate).
The price was quite high compared to some alternatives but I was willing to pay more to receive a branded product as I have had bad experiences in the past with unbranded chargers and I knew this one would see a lot of use.
Please ignore the quick rating below for picture quality and battery life, for some reason it made me full them in.