I was going to finish reading through the entire thread before I replied, but I figured I would start typing now and get it over with.
I've been an Apple user for at least 10 years, and I've worked in the IT business for 15. I got an iPad 1 last Fall. Besides the IT business, I'm also a photographer, and that's how I justified the iPad purchase; to act as a digital portfolio. Let's face it, the display is gorgeous, and carrying that with thousands of photos, and showing off photos that way, is a lot slicker than carrying around prints.
I immediately found tons of other uses for the device. So much more than I anticipated. Originally, I purchased a used WiFi-only version. Two weeks after that I decided I needed 3G, got my company to agree to pay for it, and I sold the WiFi version for what I paid for it, walked into an Apple store and purchased a brand-new 16GB 3G version.
I started using it for work, business and personal emails, work calendar and contacts, started storing all sorts of documents in DropBox, started using Evernote more, started using GoodReader to have people sign model releases on the fly (and sync to DropBox)... I used to carry either a 15" Macbook Pro or a ThinkPad T61W everywhere.. now I just carry the iPad.
I've started using it for Kindle books, Netflix, various games, Words With Friends, and some other games. I'm not big on the games, but when I do feel like playing some games, there are plenty of good ones on iOS.
Prior to the iPad, I'd NEVER have left home without a laptop when I was going out of town. I've gone out of town twice since I got the iPad, and not once did I miss the laptop.
Also, I do a LOT of cooking and baking. This is the relavant part.. I do a lot of BBQ, baking, etc. I used to look up recipes and print them out.. I would go to my kitchen and use the printed out recipe.. if I liked it, I'd shove it in my kitchen drawer to make again; if I didn't like it, more than likely I'd do the same. Now I look up recipes and save them to Evernote, and bring the iPad and dock into the kitchen. If I don't like it, I delete it. If I do, it stays in Evernote. No more paper.
The iPad has pretty much eliminated my Macbook Pro. I'm switching to an iMac 24" with GoToMyPC on the iPad.
On the business end (my "real" job) I use VPN, Exchange email, VNC and RDP to perform day-to-day Systems Admin tasks and other tasks related to work.
This thing has replaced not ONE but TWO laptops, and has added other ease to my life as well.
Just my $.02.