It might be useful 5 years from now. There was another story a few weeks ago about Mozilla implementing a JavaScript interpreter inside JavaScript itself for se

It might be useful 5 years from now. There was another story a few weeks ago about Mozilla implementing a JavaScript interpreter inside JavaScript itself for security and sandboxing. This could lead to same thing. Although it's literally 100 to 200 thousand times slower than native code right now, but that might not be a big problem a few years from now (in the next few years we will probably see a huge increase of attention towards web app security). Oh, and if this thing catches on, we won't be seeing another FlashBlock again :)