I have a 128M Lexar one. I backup data to cd-r and mini-cdr as well, but the 128m flash drive is good for things that change more often. I keep a copy of my calendar and address book on mine. Wrote a quick hotplug script to copy them over each time I plug it in. The software I use keep the calendar and address book in simple ical and vcard format so I can, as worst case, read them with a simple text editor if I I can't find a system with anything that can import. Starting to make spreadsheets of important and expensive things such as my electronics/computers and tools/gear with model numbers, serial numbers, dates purchased, warranty expiration date, etc. I keep the spreadsheet with links to scans of the receipts and manuals and burn that off on a cd every so often, but I am going to keep the spreadsheet on the usb drive for a quick reference.