I have read five novels ( Carpe Jugulum, Blackout, The Graveyard Book, Never Let me Go, and the Accidental Time Machine) and and find it far more convenient than my Kindle1/K2 for indoor reading - Ironically the battery is always charged on my iPad (I tend to let the kindle run down) and until the graphite kindle comes out, the ability to read at night is the deal breaker.
When I go on vacation though, I expect the Kindle will be in heavy rotation as my primary reader though - particularly out in BRC during the day.
Netflix, even with it's so-so iPad interface is frequently in rotation, and when Hulu-Plus -finally- sends me an invitation, I expect to get a lot of use from it.
Videos are in frequent rotation.
I've spent way to many hours on Games (PvZ, Build-a-Lot,BloonsTD)
DropBox/Good Reader/Instapaper get rotated every other day.
Innovative Use: I have a Go program that I worship (SmartGoPro) - and every Friday Night, when I get together with a Friend for our six-hour Go session, we go through a bunch of Life-Death problems, both new and old, on the iPad.
All-in-all I really like how the iPad and the iPhone compliment each other. I use the iPhone for taking pictures, Blogging, GPS, SMS, eMail, instapaper a lot. But I find that general browsing I now typically reach for the iPad.
The Laptop at home gets very little use - only when I need to hop onto Terminal.App or use Remedy (Grrrr Flash) do I actually bother to open it up.
WSJ is killer - I open it up every morning and read it on my walk to/from work + they keep improving the App! The WSJ really, really are good. What's going on at the NYT - they've totally lamed out on the iPad.
Of the three magazines I read - Time, Popular Electronics, and Wired - Only wired really wowed me, and now I actually look forward to the new magazine coming out. I haven't looked forward to the day a magazine comes out in 20+ Years (Dragon Magazine).
So, for me - iPad is a huge win. Looking forward to iPad with a retina display. :-)