I have just completed a trip to Brazil. This was the first trip in more than ten years where I traveled without a laptop. I took only my iPad and my Blackberry. It was very nice traveling without the weight of a laptop, no special airport screening for the iPad and with a little further thought I may be able to travel without a briefcase. Now that would be perfect.
With 100% reliance on the iPad, I was forced to better learn the interface. I still think a better cut and paste function is needed and there is no easy way to use DropBox or Evernote to save a web page in Safari. That needs to be addressed. Feeddler is a great RSS feed reader. It integrates to both Evernote and Dropbox and the Instapaper option works beautifully. May even get it for my Mac, but I just checked and it is only available for iPad and iPhone
One funny thing was that with so much iPad use I started to use my Blackberry like it had the iPad interface. Suggests to me that the iPad interface is a more natural way to use a computer, which would explain why young children (2-3) can learn the iPad so quickly.
One idea I have been debating for 2-3 months is giving up carrying a phone. I would keep the phone number and Phone Tag, which converts voicemails into email messages at a very high quality of transcription. I only get about 5 phone calls a week so those calls could be returned at my convenience with Skype. The problem would be handling text messages, which is the way everybody contacts me if they want immediate attention (or Twitter). Need to find an iPad app that receives the text message and converts it to an email and also gives me the ability to respond with a text message. Then I could give up carrying a phone. Might then put a data plan on my wifi iPad.
Now if Apple came out with a 7 inch iPad that fit in a sports jacket pocket every thing would be perfect.
Note: Kindle on the iPad works well but the native Kindle environment has better features. Still believe that the Kindle has the best interface and form factor to disrupt the iPad.