FlashDevelop just keeps getting better... :)
What’s new:
General fixes (code completion, search, find & replace)
Now with caching: much faster startup and projects opening
Code completion & code generation for method override’s
Updated project templates with completion for CS3 fl classes, Flex mx classes and AIR classes
FD now fully works as a standalone application (ie. on your USB key)
Updated Start Page now notifies of program updates
New extensible “intrinsic” completion support
New AIR projects
Read more: http://www.flashdevelop.org/community/viewtopic.php?t=2273