Replace PC's?
Can the iPad print to a regular printer? Does Adobe Photoshop run on any tablet? Does any tablet recognize and install drivers for any M-Audio audio interface devices? Does any tablet run Pro-Tools? Until someone produces a Tablet that is compatible with my content creation and recording studio software, no tablet will be replacing my desktop PC. My Desktop PC does everything I need it to do and then some, because I built it to my specifications and to serve my needs. Apparently, I cannot built myself a tablet, because if I could, it wouldn't be running any cell phone operating system or Android, and it would at least have laptop hardware. The tablet is not some all encompessing computing solution for everyone. Those who need less and want to impress others with their toy, will find a tablet more compelling than those of us who need a real computer to do content creation (not just content consumption).
I can see a tablet as an addition to my mobile computing environment, but I don't see a tablet replacing my laptop or desktop unless it can run my desktop apps and perform my desktop functions without compromise. For me, a hobbled, cute little tablet running iPhone OS and apps with no connectivity, expansion, camera, or security options, is useless. I will however admit that the Blackberry Playbook is a compelling product, given that is more securre and capable of doing more than "content consumption". I will be closely watching it's development. If the price is right and there are apps that I actually use available for it, I'll have to consider it, but the iPad is just a toy to me. I'm not willing to allow Apple to dictate my computing needs and then overcharge me for a hobbled, cute product.