Since I started the development of some other library I completly put AS3V aside because the Eclipse integration with FDT is currently not possible. But since AS3V is working already I decided to release a version really quick that allows you to use AS3V as an Ant Task or simply from command line.
I know it would be better to have it as an Eclipse Plug-in with nice little markers etc. but for that I need some more extension points in FDT. I do not know about FlexBuilder but it would be probably the same.
The file includes an example build and some test cases that show you how AS3V can detect common errors and mistakes. There is currently not that much documentation available for the rules and parameters you can specify. Putting a list online with all rules and nice descriptions is of course something I would like to do but currently the time for that is missing. I hope everything is self-explaining if you have a look at the readme and example files.
Update: The AS3V package has been updated with one bug fix and some modifications so that AS3V will produce a more interesting log output if it fails for some reason. Using AS3V with Eclipse works only if you specify
fork="true" like in the Flex SDK example from the build file that comes with the zip.