This pundit
http://gizmodo.com/5458531/why-the-i...-ebook-readers
is saying a lot of you are wrong - that the iPad WILL have an effect.
Ignore the article's title - it is a bit inflammatory and somewhat off the mark. The article appears to be claiming that where Apple will succeed is selling the iPad to "new" customers which are not enticed by current offerings (essentially customers who are not on Mobile Read at all). So not really crushing existing devices so much as stealing future customers away from them, which they could have had, in large numbers.
I do not know whether to believe the author - I thought everyone had a desktop, laptop, netbook or smart phone by now. So not sure about who/where/what these new customers are which will buy an iPad.
I agree with those posting here that the iPad has a good chance to have more of an impact on the Periodical market going wireless, electronic and essentially being saved. Everything I read implies it is a grim affair to attempt to start a new magazine now.
Gourmet died this year
http://en.wikipedia.org/wiki/Gourmet_%28magazine%29
It would be interesting if it were to resurface on the iPad.
*** Edit ***
I see Simon John Cox's post above mine and the article I referenced says much the same as what he states in his first paragraph.