I love my netbook - a Samsung. I couldn't be doing with typing on a tablet screen for any length of time, you have to sort of hunch over it, and the on screen keyboard takes up half the screen.
Netbook screen is propped up at the right angle for viewing, can sit on your lap quite comfortably for both typing and viewing without having to hold it or find something to lean against.
Netbook has a built in screen protector when being carried around - the keyboard.
Netbook has more connections such as usb ports, memory card slots etc.
Netbook will have a much bigger hard drive.
Mine has a webcam and mic, so can be used for Skype (as can most tablets).
There is nothing a tablet can do that a netbook can't, as far as I know.