Biggest Threat to the iPad
The biggest threat to the TamPad (thank you Stephen Colbert) could be a similar device running ChromeOS at half the price. But the problem for Google there is that today 1) there is no ChromeOS and 2) there is no Google tablet.
Apple is adept at re-inventing a category and then staying one (or more) steps ahead of the "mee too" followers. As an example Google's Nexus one is probably the best Android phone you can get, but few seem to think its a real threat to the iphone. Maybe the Nexus Two, but by then there will already be a 4th gen iPhone. Notice I didn't mention the HP Slate.
