Can you make apps ON an ipad?
The iPad is a computer, you'll still be sitting infront of a computer screen regardless, only you'll be staring at a MUCH SMALLER screen.
Most laptops are around 3-7lbs in weight, Ipad is 1.5lbs. 3-7 lbs is hardly BULKY, its like one of them chick free-weights you see at the far end of the weight rack.
I would go insane using an iPad to do any heavy typing, ones words per minute would go down DRASTICALLY, making every instance of typing take longer LONGER!!
Laptop too hot on your lap is silly unless you have delicate legs, PUT ON SOME PANTS, KINJO! :P
My opinion on the iPad is that you are paying more for less power, smaller screen, inconvenient typing interface, and a second internet bill. All for what? Size. You can take it more places which means it will be exposed to more environments and situations in which it can be damaged and stolen.