MP3 players and wireless technology are the things that come to mind for me. The ability to carry thousands of songs with me in one device was phenomenal. I had hundreds of CDs prior to my first iPod in approximately 2006 or 2007. I still had wired headphones then but I could have all my music and more! Now I have wireless headphones which, for me, is amazing. I talk on the phone to family and friends regularly and having my hands free allows me to get more done while I talk.