I admit to not reading the much-blogged closures proposal all the way through for the simple reason that I use Java version 1.4.2 at work (frankly, I have little to no say in the matter). I'm still waiting to throw out xdoclet for language-level annotations.
Nevertheless, I'm still glad to read Java Closures? Or just functors? Or just confusion? . Antonio does a great jorb defining real closures and functors, and thereby skewering the value of the proposed Java "closures". I especially appreciate this because I am consistently annoyed whenever people refer to a mere anonymous code block as a closure. Back when I used Perl more, I remember understanding code blocks (and references to code blocks) just fine, but having trouble understanding closures. I suppose it's a fine line, since languages with anonymous code blocks probably have lexical context and allow the code access to it, but try to answer the question "can someone create a full closure in Python?" and see how complicated the difference can be.
I didn't know about C++ functors until now. Of course, the term functor also represents a different technique in ML languages...*sob*