Well that'd be my laptop. I can do work, check emails, surf the web, text, watch movies, listen to music etc etc. I do not use the cell as much because I don't really call anyone except at work.
To me the laptop is like an all in one entertainment centre. Sure it lacks the live TV and stuff but that can be easily solved with a TV tuner. There are many gadgets out there that are trying to replicate the all-in-one functionality of a computer into a tablet or cellphone simply because a computer can replace so many things.
I own an iPad and a Samsung Galaxy S2 as well but they are just not as multifunctional as a computer. You can't have 3 different apps all opened on the same screen at once and navigating between apps/programs certainly has a little lag time in comparison to alt+tab on the good old PC.