I have a netbook, which serves pretty much all of the needs a tablet PC would, and a little more. It's hard for me to give up my real keyboard in favor of a virtual one.
That said, I yearned so much for the "tablet experience" that I bought both a Nook Color and a Kindle (a bargain, refurbished, for $139...:) Obviously these are primarily e-readers but they offer a lot of tablet functionality, especially the Kindle.
At this point I think my 3 toys equal one table pc so no, I have no plans to spend money on an IPad or any tablet like it. Interestingly, the cost of all 3 of my devices is still less than one IPad.