for my engineering class we have to pick a device that is already invented and design something off of it. it has to be something that can use some improvement. I was thinking cordless headphones but I guess they already have those haha.

so can anyone give me some ideas? thanks

and again its not full out inventing something and it has to be realistic (not like a time machine)

a while ago I mused about an mp3 player with gnutella wifi support so it could tivo music for you whenever you were in a hotspot, but the iphones and zunes can all download now so its sorta been done