I've had my iPad2 for about 6 weeks or so now. I posted before about using it for business use - but it really has changed they way I work.
I now take the iPad and an Apple wireless keyboard out with me on client visits. I used to lug a large 'bag on wheels' about as taking the Macbook Pro was a 'must'. Now a much slimmer bag accompanies me with less 'kit' in it.
All of the documents that I used to 'run off' a copy of on the printer are now on the iPad and I use iFiles to get documents on and off there. All of my precedent documents are now in iFiles - when I want to open a copy of a precedent document to use for client information to I just hit 'Open in Pages' - and there is a client copy to 'fill in' via the wireless keyboard. I either e-mail it back to myself or save the Pages document in iTunes and then save it back to my Macbook Pro.
Funny how quickly the 'Pro' has become the home-based machine and the iPad has replaced it to become the laptop equivalent. Taking the 'Pro' out with me now would seem like lugging an iMac around!
The other net gain is that the laser printer has hardly been on since I had the iPad - I just don't need to print anything any more.
I use my iPad for all the usual 'fun stuff' too - but its as a work tool that it has had the greatest impact. No doubt we'll see advances in the OS being able to support a directory structure in future which will make the iPad even more useable as a fully-fledged business tool.