Since this the topic of iPod quality, replacement rates, etc. has come up several times here, I thought I'd share this link (giving credit: found the link through LEM).
ipodnn Link
The gist of the article is that ipod quality and failure rates would appear to be similar to that of other consumer electronics.
So, given these quotes:
There's about 5.5-6 million failed iPods out there. That means there is a *combined* 2.3-2.5 million other failed HDD based players out there, spread across all the other makers. And that's following the normal statistical rates of other devices. If you sold 70% of your market and have failure rates that match your competitors, you obviously have more people complaining about your failed products. Simple numbers, but it seems some online pundits can't do simple math.
That's why I take all stories about how horrible iPods failure rates are with a huge grain of salt when they start going on about all the people complaining online. 
Now imagine all the space in landfills these "disposable" consumer products are taking up.
I know that Apple has a recycling program, but does any literature about it come with new Macs or iPods? I haven't bought a new Apple product since they started the consumer recycling program, so I don't know.