Unless you use EV-DO to connect to the Web on your laptop, chances are you aren't using that PC card slot on your laptop. It's generally used for connecting to the Internet, and most laptops have built-in wireless, making the slots useful for but a few niche tasks.

Might as well take advantage of a slim hole in your computer, don't you think? The StashCard is a little container for hiding things like SD cards, money, keys, or whatever else you can fit into your laptop's PC card slot. You'll feel like a spy of the dorkiest kind when you slyly sneak illicit photos and keys to your hidden bungalow around in your laptop. Best of all, it's cheaper than pretty much anything else you could buy to put in your PC slot at a mere $10. — Adam Frucci

StashCard, via Book of Joe