Wouldn't a Netbook be more useful than a tablet? Can't they do pretty much everything tablets do, but more, since they have keyboards, storage, etc?
Wouldn't a laptop be more useful than a netbook? How can you get the netbook concept but not get the tablet concept?
Here's the deal - smaller, lighter, easier to use. Less of what you don't need and less issues. Compromises to be sure, but convenience makes up for a lot of the compromise.
You have a desktop to do the serious work. The laptop or netbook is a backup. The tablet is for fun. Dopey quick games, movies, music, RSS feeds, facebook, IM, SMS, ebooks, everything you can do on a phone, but with more space.
If you're happy with your phone, then tablets are probably not for you. But if you want a little more, than tablets are an option.
Personally, I prefer the smaller form factor. The 7 inch models are far more suited to my needs and less cumbersome. The HTC Flyer is my own idea of state of the art.
As for the cheapo Android units for under $200? They don't have capacitive touch screens, so they are next to useless for anything other than consuming media. Typing is tedious, and selecting items without a stylus next to impossible.
If you missed out on this deal, the Touch Pad is $399 everywhere this weekend. In addition, I believe that Staples has a coupon for an additional $100 off. If that coupon has expired, my apologies for mentioning this.