My free time at night (after 8:00 pm and the wife and kids are sleeping) used to be largely devoted to gaming on my 360, PS3, or PC or watching Netflix/Hulu on TV. Since getting my iPad, I have been using it all the way up until I go to bed every night. It's so much fun for me to be able to do anything I want on my iPad right from bed and then put it down and close my eyes when it's time to sleep. I'm actually getting more sleep and better quality sleep because I'm not falling asleep on the couch every night and then waking myself to go upstairs and go to bed.
I could see myself someday getting rid of all the gaming stuff and going with more casual gaming on my iPad or whatever device is the in thing at the time. I use my home entertainment devices a lot less now that I carry all my entertainment with me.