he probably just spends time gazing at them and wishing to own them.... people do stuff like that. Me too, but now with apple products. With me it's more likely to be a travel site
If you are interested in a slightly less heavy-handed approach. I wrote this to steer me away from the distractions. Just click the browser button to "block" new domains. You can unlock a page, but you only get a 5 minute window. This works well for me and most of my colleagues are using it as well.
But I think you have to separate full and pure entertainment value from partial entertainment and learning for sure.
Of the above list, while there is certainly entertainment on HN, some of the others you listed are definitely less important learning wise other than perhaps lifting your mood.
I didn't make an app to customize this list. Nor am I going to spend the next twenty minutes explaining why it works for me.
It works for me.
=)