Generally

• It's crazy fast.
• It's heavier than expected (maybe a little bit to heavy)
• Writing with the keyboard works good. Within landscape mode I can even write with ten fingers.
• Safari rocks. It's really the web on your fingertips. It's very fast and inline videos (with fullscreen mode) are cool.
• iBook is great. Good handling, good looking, easy to use dictionary. (Kindle is also great)
• In general reading on the iPad is fun (but I also like reading on the iPhone).
• The speakers are good for me (but I'm not very demanding here).

Random 3rd Party Apps

• Penultimate (writing with a fingertip) looks good, will see how this is working in practice.
• AirVideo (Streaming video to the iPad) is stunning.
• Old iPhone games like Super Monkey Ball are fun again - actually more fun.
• WoframAlpha looks great and has a nice keyboard