A lot of people obviously don't feel the same, considering the tremendously large backorder the Transformer is at right now - even with its limited initial supply, it'll take WEEKS before the demand is even met from the initial launch.
There are many, many uses for a tablet, too much to even get into every single one at the moment.
But after reading more and more about them I'm looking at ways to sell my fancy cell phone and get the cheapest one I can with a good 3g/4g signal and spend the money on a 7 to 10 inch tablet to carry with me for light browsing. After a few years of smart phones and browsing the internet on them I'm finally fed up with the lack of screen real estate. I'd love a high res 7" but you can't have everything.
Tablets are awesome and becoming essential in a day in age where almost every room has something controlled by computer hardware. It's the universal remote that allows lite gaming, portability, open ended-ness, and so on and so on. I can't wait to get one.