I posted this link on another discussion. But Stephen has asked me post it again here. This is a better place for it.
This is a 2D Virtual Camera. This extension allows you to create a camera on the Flash stage and animate through environment. The resulting movie will publish as if you are looking through the camera.
The best part is that this extension places the new tool "2D Camera" in your tool bar (grouped with the hand tool). You need flash CS3 to use this extension.
You have to pay for this one I think, but some of the animators at the studio I'm working at use this: http://www.animonger.com/animsliderpro.html
Its a slider tool that allows you to scrub through the embedded frames of a symbol and assign instances quickly. The kids I know that use it use it mainly for lip sync, like if you're using a lot of different characters with different mouth charts its quicker than going into the symbol every time you need to change a mouth shape, you just click and slide to the frame you want!
I'm trying "Auto Save" from Trick Or Script (http://www.trickorscript.com) It's a free plugin that auto save your work each two minutes ( you can change the save time). For another amazing plugins you have to pay. The new version works in Flash CS3