Prior to yesterday, if you wanted an iPad that worked just like your computer, you pretty well needed to buy a Microsoft Surface. But thanks to Parallels Access that has all changed. This is an app on your iPad that allows you to control applications on your Mac or PC. But unlike some other remote login options (like Logmein Ignition) the control you get is very touch like. Basically, you can use the same iPad touch intuition to do run any other application. The service costs $80 a year but there is a 14 day free trial (no credit card required) and using it on the University of Toronto wireless, it was very responsive. Indeed, there were a few little lags but they were hardly noticeable. This may be the option that finally allows me to leave my laptop at home when travelling. Time will tell.
Anyhow here is an iPad screenshot so you can see what it looks like.
Digitopoly 
The Asus Transformer line has been around for a few years, well before the Surface and it works quite well as well. It gives you a tablet and a very nice keyboard / touchpad combo that also extends the battery life to beyond MBA levels. Definitely worth checking out. In combination with Splashtop it’s even capable of playing 3D PC games.