I have a macbook air, which i use as my primary computer , and i will be getting ipad as well. I will use ipad mainly for apps, watching tv in bed, reading books/magzines/news papers etc on bus, and a little portable gaming as well. Also, i will be using it to view my lectures in keynote. Calander also looks really cool on ipad, i just can't use calander app on my macbook air, but i think it will be fun making events/ appointments on ipad using fingers

. Basically the main reason im getting ipad is because of apps, and ease of use.
Almost everything i described can be done on my macbook air, but i think it will just be more fun and better to do things like studying the lectures in keynotes outside. Also im hoping that there will be books available for college students, so i dont have to carry them on me.
I will still use the macbook air for taking notes in class, Watching HD tv shows/movies connected to my 24" monitor, video chat, typing long essays, and everything else that you do on a normal computer like syncing phones, downloading etc. IMO ipad can not replace a laptop or desktop.
I was thinking of selling my macbook air to get a macbook pro, but then again my macbook air does everything i want it to do, and does it really fast. The SSD really make the air fly lol.