Have you ever thought about an invention that maybe YOU can't make, but it sure would be nice if someone else did?
I wish someone would invent a non-storage mp3 player. It would just consist of a female USB port, a headphone jack, an LCD screen, batteries, and a clip (optional). You plug in any USB storage device, whether it's your 1 GB keyring or your 300 GB external hard drive and it automatically finds all the mp3s on it and plays them. Or it tells you to put all of your music in folder of a certain name (like "Music"), and then it treats all of the subfolders in that main folder as playlists.
It would be cheap ($20-25), small, and easy to use. The batteries would have enough power to run whatever needs to be run in a thumbdrive (Obviously the big hard drives would need another power source). It would output a high quality signal to a stereo or to headphones, depending on whether you used it for a portable or home stereo.
So, you want to invent it? Already know about a gadget just like it? Got a reason why it would never work? Got some suggestions? Got your own "I Wish Someone Would Invent..."? See you in the comments!