[spacemanaki]

It's a very useful hack but I would hardly call it a great strength. As a module system it completely sucks.

It does leverage one of the language's great strengths, lexically-scoped first-class functions, but that doesn't make it a strength on its own.

[Androsynth]

Not sure if anyone will ever see this...

It is not a traditional module I will agree. However I see it as a hybrid class/interface/module and in this role, it works very well and allows you a tremendous amount of flexibility due to the dynamicness of js.