hi there, long time no see … but we are very busy working on some interesting projects and writing the second edition of our “workshops for flash” book.
the latter is also the reason why we are using flash cs4 more than we usually would … and especially the cs4-built-in-actionscript-editor … *phew* what a mess that is. no real auto-completion, no auto-import and the flash-help keeps opening my browser with the online flashhelp :( really annoying.
but there are some ways around this behavior.

offline browser solution:
http://www.jonnymac.com/blog/2008/12/09/offline-as3-language-reference-no-air-application-necessary/

air app:
http://labs.bigspaceship.com/2008/12/09/air-app-as3-language-reference/

great stuff :)
cheers