What's the Oldest Piece of Technology You Still Use Today?

I'm sure many of you have ancient, obsolete gadgets kicking around your home, maybe gathering dust in the back of a closet somewhere. You know, that old Mac Plus you didn't have the heart to throw away or an old cassette Walkman in the back of a junk drawer somewhere. But how many of you still use on a regular basis a… » 5/15/08 11:00am 5/15/08 11:00am