Avid readers of this site know there’s an endless amount of nutty USB-related gadgets out there. But here’s one that’s actually handy, in the office or on a business trip. The QMemory USB Card Disk with Calculator is pretty self-explanatory: it’s a wallet-ready 256MB flash card—that’s also a solar-powered calculator! It even includes security software to protect your files. No batteries, chargers or software required. Although we think 256MB is way too small in this day and age, we love it’s functionality and price of $15 USD. You can also order them in bulk, with your company’s logo.