I have had my iPad for nearly a year now and absolutely love it. Of course, it is a 1st gen without a camera, but I have a iPhone4 for that. I use the iPad way more than my regular computer. If you type a lot of emails (or long emails) you might want to opt for the wireless keyboard.
I use my iPad a lot at work... but mainly just to show customers something from our website, looking up info from manufacturer's websites, or pulling up a PDF file. I do a little bit of work email, but not usually enough to need the wireless keyboard.
I don't do much note taking, but I have been thinking of getting a stylus for such purposes... now that it's fresh in my mind, I may pick one up on the way home tonight.
I bought an airprint capable printer, and now consider it a must-have for my iPad. The wife and I can also print directly from our iPhones. Of course, the printer works wirelessly from both of our computers (PC and Mac), and it will scan a document wirelessly to either computer as well.
My final comment is regarding 3G. If it is within your budget, you may want to get it, even if you don't think you'll use it much. You don't need a contract, and you can start and stop it any time from the iPad itself. I use the 3G all the time... especially as a giant GPS screen. It is wonderful for looking up info while on the road without having to find a wifi spot. I can't imagine having my iPad without 3G.