I'm not used to using IDEA to run my ant builds, but I'm going to start using this feature as often as possible. I just discovered that when you run an ant target from inside IDEA, and you have the option enabled to Autoscroll to Source, IDEA jumps around in
build.xml from target to target as it runs: I can visually trace ant as it executes!
To boot, when it is working on an individual class (compiling, say), it jumps to that source file as it works.
What a great visual indicator of how the build is progressing!