I'm splitting up the previous thread because there was imo too much confusion between which build tool to use for the Flex SDK and which build tools we should support (aka create artifacts for). These are two totally different discussions.
This thread can be used to discuss which build tools we should support. E.g. for Maven we should create Flex SDK artifacts that will be deployed on a repository, for Ant we should maintain the ant scripts which people use to build their project, etc.