I need a computer that is small, cheap, lightweight and has reasonable battery life.
That's why I bought a Samsung NC10 netbook around a year and a quarter ago.
I take my netbook to uni where I use it mostly for taking notes and programming mostly Java with a bit of Python (occasionally use it to program an Arduino Diecimila via USB), also Matlab (though I tend to run that remotely).
I wanted full disk encryption so I run Windows 7 Ultimate and Fedora 12 Linux (LUKS) though I've run a variety of other OS's (BeOS Haiku, Plan9 etc...) on it in the past both directly and virtualised. I can hook it up to the projectors or large screens in the conference rooms so as to extend the screen. It works with the Java based VPN software that the uni uses so that I can log in to the wireless network securely whilst on campus, and connect whilst off campus.
I like leaving my messenger, Skype (for video chat) and IRC clients running in the background. And I can store my 80GB or so of media on it. Occasionally I play some old PC games on it, and in a pinch I can use it to charge up my iPod or iPhone.
For the most part it runs pretty quick though the virtualisation can be very slow. So far it's been working pretty well for me.
Though I have upgraded the RAM, Wireless card and swapped the hard drive... I guess it wasn't so cheap in the end.
Maybe I am just "too cheap or too poor to buy a real computer". Even though I do have a real desktop computer at home, unless a Mac Pro 1.1 isn't classified as a real computer of-course.
So what out of that can the iPad do better?
Hmm well better battery life and lighter I guess, also maybe note taking. Oh and the iPad's screen is likely to be better.
It also may actually be able to perform a lot of those tasks through the use of remote desktop (or ssh), though this is likely to be slower than just using the netbook.
This isn't to say that the iPad is bad, notice how my paragraphs are mostly starting with 'I'. What I want a portable computer for is likely to be completely different from most other people.
I'm actually considering getting an iPad, though it won't be a replacement for the netbook. As when I'm at home I quite often use my netbook/old laptop/iPhone just for browsing the internet, checking my emails, listening to music, reading an ebook etc... The iPad seems perfect for this.