Is there a tablet PC (like the iPad) out there that works with a pen/stylus?

I need a device for university to:
-access Wi-Fi internet
-view Powerpoint (.ppxt) lecture notes
-type notes
-be able to draw diagrams with a pen stylus (so some sort of touch screen or touch pad would be necessary)

The closest thing I’ve found to it is the HTC Flyer:
http://www.techgoondu.com/2011/04/27/hands-on-htc-flyer-available-in-may-singapore-for-s1068/

Can anyone please recommend some such device that uses a pen stylus?
Thanks, much appreciated.