I just made my own Ant Task:
https://bitbucket.org/andkrup/a3tasks
The tutorial on apache ants homepage was very easy to follow and the work to do is really easy as well – if you can run Ant tasks in eclipse you can debug and run your java code as well.
This particular Task allows a user to specify a folder with image files which, when the task completes, each will be embedded in their own as3 class file.
It’s all very basic and there’s a lot of refinement to be done, for example there is a lot of stuff to add to support font embedding, and swf embedding is not supported at all. But this could help shave off some time embedding a lot of external assets without using the flash IDE.