Well it doesn't seem to work all the way. I'm not sure what you meant when you said it has "_full_ javascript support" and is "very mature technology". I tried it out with amazon.com and none of the menus seem to be working...

Feel free to give it a run through: http://bit.ly/5WVsw

(this is cgiproxy 2.1beta19 running on mod_perl on a fresh lenny instance -- no ssl configured here)