At work, I have to program in Java. (Since I'm a Perl programmer at heart, this is obviously not a stable job.) If I scratched a mark on my desk every time I encountered a situation where a closure were the simplest way to implement something and I could not use it (since Java doesn't have the concept), there would be only splinters left. You can simulate closures in some cases by using anonymous inner classes and instantiating anonymous classes from (possibly private) static interfaces, but it looks horrible and you only get half of the benefit.
Closures are incredibly powerful. Now if we only had call-with-current-continuation in Perl, we could save not only the calling context but the call stack as well...
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