I-pad, Kindle or...?

It’s been long-awaited, the I-pad – and now it’s here. My question is to those who have a Kindle or another reader – would you upgrade yours to the i-pad for a reasonable price (a new one is $500)?

Also, what will the next gadget/breakthrough be? Are you waiting for the next one? What features are you looking for especially? Here’s a link for those who haven’t seen it yet: http://www.apple.com/ipad/features/