My Mobile Phone though the battery life sucks. Still my favourite can do everything and yes, even a radar for police vehicles. :-)
I'm with Rohitpatel...my laptop. I take it everywhere I go and I get all my communications, music and media needs taken care.
As of late, my digital camera, I'm always walking around taking pictures of stuff and putting it on the pc, I find it fun. I have gotten my butt kicked a few times because I take a picture when someone is just waking up, or while they are "trying to cook and can't crack an egg". Its all good
My mp3 player goes everywhere I go. I like it better than am ex
I love my laptop. I bring it almost everywhere I travel. You can do so many things with! Communicate with people, find a job, and so much more.
Laptop > Cell phone
I guess I would have to say my computer or my digital camera. The camera is also a video camera and is very small and convenient. I definately get my use out of it.
I like to have a PDA, but still I am not having any special need for one.
Therefor a MP3/4 can be good for me.