iPad may be cannibalizing laptop sales by as much as half according to Best Buy CEO, Brian Dunn:

Mr. Dunn also said internal estimates showed that the iPad had cannibalized sales from laptop PCs by as much as 50%

It will be interesting to see how much, if at all, they cannibalize iPod and MacBook purchases, and if they're in it for the long haul or the cannibalization stops when most of the people who want an iPad get one.

[Wall Street Journal]