I was not a fan of the Mac Mini until I saw it in action on YouTube. People are using the Mac Mini instead of the Apple TV. The Mac Mini is much more versatile for handling digital media than the Apple TV.
Anyway another use I might employ for the iPad would be controlling the Mac Mini which could be hooked up my television. The virtual keyboard on the iPad via bluetooth.
Imagine having all your digital media etc on your tv controlling it with your iPad.
Unlikely over Bluetooth. It would be interesting if the iPad could send keyboard siginals to the Mac or PC like a keyboard/trackpad but unless some 3rd party wants to write an App and driver for that I can't see Apple doing it. At best your going to need a VNC to screen control the Mini. Upside is you can also do limited remote video display.
Good to know. And Apples choice to build off the iPhone App catalog once again proves wise. Think, if they hand gone with a full OS it would be unlikely those Apps would work on day 1. (personally still like having the option of seeing the screen from another room myself, or to zoom on a single element if my bad eyes can't make it out from across the room)
There are stylus pens that work on the iPhone/iPod. I need to get one myself. Pogo comes to mind as one: Pogo Stylus
I think there are developers already working on handwriting recogintion note taking apps. Apple showed off one 3rd parties painting program that's going to get the bump up to the iPad.
A lot of stuff is going to be there for the iPad day 1 just because of carry over from the iPhone, I think far more then people are really aware of.