A load of people at work have been buying these from eBay for about £20 but play.com have them even cheaper. These are supposed to be stunningly fast and ideal for using with the Microsoft Windows Vista ReadyBoost feature to speed up disk access.
See here for more info on this featurehttp://www.microsoft.com/whdc/system/sysperf/accelerator.mspx
* Min 20MB/second sequential read and write
Serious professional photographers who demand one of the fastest, most rugged, and most durable memory cards on the market should choose the SanDisk Extreme III SD card. Built to work under the most challenging conditions, with SanDisk Extreme III you'll get more speed, better performance, and unmatched reliability.
That's because only SanDisk Extreme III memory cards feature innovative ESP Technology for the fastest speeds and highest performance. ESP stands for 'Enhanced Super-Parallel Processing'. Simply put, it means you are getting the fastest read/write speeds available - an amazing minimum 20MB per second** sequential read and write speed - speed you'll definitely appreciate whenever you find yourself shooting and storing pictures in harsh environments, extreme temperatures or at high altitudes.
Every SanDisk Extreme III SD card comes with RescuePRO® so you can recover images, documents, mail, video, music - just about any digital file, with ease. Built with leading-edge media recovery algorithms, RescuePRO lets you preview recoverable data before you try to retrieve it. With RescuePro's unique recovery algorithm for MPEG audio and MPEG video recovery (MPEG-1/2/3) what you see, and what you hear, is what you can recover.
RRP: £80.99 You save: £63.00 (77%)
Price reduced from £17.99 when I first posted to £16.99 now.