I have used the U3 and CruiserSync for years. I use them to securely (with password protection) backup and store files and folders, which I can access from any computer without leaving anything behind on guest computers. What can I use on new Sandisk USB flash drives (I just bought a 32 GB device) that provides me with those same or similar capabilities?
for password protection adn encryption SanDisk Secure Access is stickied at the top of this board, the post has the download links.
A company called dmailer made Cruzersync for SanDisk. It can still be purchased through them at their website http://www.dmailer.com/dmailer-sync.html it is now called dmailer sync.