I've compiled a list of useful extensions and plugins for flash animators. You can also view this list on my tumblr, in case formatting got screwed up: http://zedrin-stormshock.tumblr.com/post/39765359684/flash-animation-toolbox-guide
To install these plugins, download them, open up your Extension Manager, click ‘install’, and select the .zxp or .mxp file. There should be a description in each file of where to enable the plugin in Flash.
Toon Monkey (David Wolfe)
These are a collection of tools to suit your fancy. Most of them do single functions, so read their descriptions and decide what would be useful. I've listed some of the ones I recommend.
For assets and puppet rigging, I would recommend libAppend and Search and Replace, which allow you to rapidly name and rename symbols.FrameEDIT and FrameEXIT make editing nested symbols easier by taking