For me it is my I-Pod. I love all types of music and remember how cool it was when I got my first Walkman and I could listen to my tapes on the move. In college I carried cassetes with me whereever I went, it was a pain in the butt and they wore out. Now I've got this little gizmo with 4,000 songs, tons of audio and video podcasts, and a few TV shows on it. I can play any song I want through my car audio system, while on planes, while walking the dogs, etc., etc. Back in the early 80's I couldn't imagine a device such as the I-Pod could hold so much media.
For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. - Carl Sagan