I'm not saying that in a douchebag way, I'm just saying it because you'll get a more informational answer from the there than the retards on this board (hi, Thrilla!).
If it had a keyboard, was upgradeable and customizable, than I would agree. Windows Mobile phones are better, IMO. The Apple UI is nice, but there are programs for my phone that duplicate that, anyway.
You go to your bathtub. You plug it. You fill it with water. You open the MacBook. You start iCal. You put said MacBook in tub. Do the same with the phone.
Voila - phone sunk with MacBook.
That will be $300.
If you feel like you need an adventure, you can try it on the beach.
But, don't try it in the toilet. That would be a rookie mistake, The MacBook will not fit.