We mentioned the launch of the Amazon Kindle device in the UK recently, but now it's the Amazon Kindle store's turn to grab the headlines.The store has flung open its virtual doors in the UK ahead of the Kindle's launch. That actually wasn't due until 27th August, but has now been pushed back to September, selling for £149 if you want the Vodafone-powered free 3G device, with a Wi-Fi-only Kindle up for £109.So why launch now? Well, two reasons. Firstly, you can 'reserve' your e-books ahead of that launch, so they're ready and waiting for you when your device lands. But there's another reason - those 400,000 e-books (including 84 out of the current 100 bestsellers in the UK) are also available to view on other devices, including the iPhone, iPod touch, iPad and Android handsets.So if you have Kindle for any of those devices, you can buy e-books in UK currency right now at the Kindle store.