Video games.
Video games are entertaining.
Anything can be addictive in excess, or even with normal amounts.
I read an article in the Sunday Oregonian pertaining to China creating an "internet rehab center" where parents sent their children and people actually attempted suicide on one of the more intensive floor units.
I think there's an issue when people cannot go without their Blackberry, Vaio, Bluetooth when driving, Tom-Tom to figure out where you're going, Ipod to listen to when you get out of the car, and various other little gadgets.
Within the same newspaper was an article about a 32-year old graduate student who went one month without any technology past the 1950's, including such things as television (since they weren't that common.) As much as I love every toy I have, I really cherish listening to my grandmother's stories about horse and buggy transportation and the Great Depression.
The more we use technology to speed things along and 'stay connected' the farther we drift apart.
Where playing with friends down the street once filled children's afternoons, now LAN and System Links create a void of social interaction, beyond tactical speech pertaining to games. I took an English class two years ago where several people LITERALLY didn't even know where to put a stamp, or how to address an envelope...that same person spoke often of his PC games.
http://www.oregonlive.com/oregonian/ The articles are somewhere there...in yesterday's (Feb 25th) paper.