I use a bit more my iPad 2, but not in everything. For example all those advanced pages on the net who contains JavaScript or Flash, then I use my Dell N5010. And I can't have MS Office 2010 Enterprise too heheBut yes, to check something faster I open my iPad who is turned on 24/7 rather than my laptop who is turned off when I get back from work.
Not really. Most people are light users.Truly amazing when you think about how many people will use the iPad in place of a desktop.
The iPad supports JavaScript. Did you mean Java? (despite the similar names, the two are essentially unrelated.)
I can see where they might replace a computer for consumers, but it's going to be quite some time (if ever) before they replace a full blown computer for serious design, scientific, fluid / thermal dynamics & a host of other computational work.