The last couple of hours I added the following features to RubyJS:

• Iterators
• Modules
• Whole program code-generation, including automatic dependency checking (that sounds complicated, but it's nothing more than introspecting which classes/modules to generate code for and in which order)

Again some statistics:

> cat *.rb | wc -l
    2450

> cat *.rb | grep -E -e '^[[:space:]]*#' | wc -l
     623