I've searched high and low but couldn't find this posted - cue someone to tell me that its already been done! Anyway, saw this instore today by entertainment/electrical section & behind the counter (if your sainsburys has one!), seemed to be plenty available:
8GB high speed USB 2.0 flash drive
Shock resistant & splash-proof
Available in pink or blue
Vista compatible (aren't they all??)
***EDIT*** Personally tested 8GB on Vista appears to work with readyboost (although packaging does not confirm this).
Also contains Secretzip software pre-installed on the Flashdrive:
SecretZip is a user-friendly, multi-featured compression and encryption tool that is
bundled with this PenDrive. Capable of running directly from the PenDrive, SecretZip
expands the available storage room in the USB device by providing zipping and
unzipping functions. Its graphical user interface provides easy-to-use drag and drop
functionality. It also includes the ability to decrypt Zip files encrypted with SecretZip,
providing high standards in data privacy. Having SecretZip in your PenDrive is a quick
and efficient way to transfer downloaded files because installation is not required;
zipping and unzipping files is just a few clicks on the mouse.