I want to try to use FlexJS with FlashBuilder
I https://cwiki.apache.org/FLEX/flexjs-status.html
And the page with the description how to set environmentreturn to me 404 error: https://cwiki.apache.org/FLEX/using-flexjs-with-adobe-flash-builder.html
This is the current page from the WIKI for using Flash Builder. https://cwiki.apache.org/confluence/display/FLEX/Using+FlexJS+with+Adobe+Flash+Builder
Also, Josh Tynjala has been working on some very nice tutorials and tools for FlexJS. He has a tutorials for the other IDE's. at NextGenActionscript.com