The only thing driving my want for a new laptop is a better graphics card for a few games that overall I can actually wait till this one dies to purchase and play. But I have had it 3.5 years now and it chugs along just fine probably because it mostly stays in the same place but I do take it out on occasion so the semi portability of the 17" monster that it is comes in handy. (I really really like screen real estate) And even when it is time to replace it I am sure I will give it a once over and maybe throw a new drive in it put linux on it and let the kid have it to replace the hand me down desktop he is currently using.
My mp3 player is the same age and will probably last even longer as I have one with a user replaceable battery and barring out and out losing it or breaking it I can't see a reason to replace it with a new one just for the shiny factor as it does what I want an mp3 player to do. Heck my wife only replaced her gen1 ipod nano because she lost it though it really was due for a new battery and that probably would have been as much as the replacement she bought.
I don't know I can just think of other stuff to spend my $$$ on than gadgets I don't actually need.