"In fact, I am trying to migrate as much of my communications applications (twitter, mail, social web) to the iPad and leave my computer for actual, productive work."
+1 on that. At home, I basically use my iPad to do all my consumption and "light" communication. For development and highly intensive typing, I'll switch over to my laptop.
When I'm relaxing on a weekend, I find that the iPad is about 80% of my computer time. This has been a huge shift.
On the other hand, I haven't been able to effectively use the iPad at meetings. I had thought maybe I could take notes on it, but it just doesn't flow as well as when I'm typing on real keyboard. However, it does rock for demos.