The iPad's ebook store is evidently US-only, less likely because of copyright laws themselves (as many are claiming) than because a lot of books are licensed to publishers by country, and if an author did not contract a book for distribution in Asia (for example) it can't legally be sold in Asia. Some authors think this will allow them to contract separately by country or language and make more money...when in fact it only means that people outside the US will have yet another reason to steal the damned book. The only way to reduce content piracy is this: Sell it cheap, sell it easy, sell it everywhere. Anything else is wishful thinking.
Here's a great short piece by nanotech guru Eric Drexler on why tokamaks won't ever be widely used in commercial power generation. My favorite line in the whole thing: "...[the Sun] puts out less power per unit mass than a good compost pile." Fortunately for us, the Sun is a little bigger than a compost pile. (Thanks to Frank Glover for the link.)