I know that I have a few that I would have a tough time giving up. Here's a couple of devices that I use a ton throughout each day.
1) DVR! I record a bunch of shows and also love being able to pause live tv.
2) Dell Streak. It's a very large phone, but I love the screen for browsing and it's very good on the reception front.
So what are some electronic goodies you may not be able to live without?