Fix Eclipse confusion running Ant tasks
Sometimes, Eclipse seems to get confused when running Ant tasks. For instance, when I upgraded to Eclipse 3.5.1 from RAD, I would double-click on an Ant task and then Eclipse would ask me what task to execute (as if I hadn't just told it).
The solution is described here: http://www.spacebug.com/removing_ant_configuration_selection_in_eclipse.html
Basically, from the top menu select Run->External Tools-> External Tools ... and then delete the existing Ant run configurations. Once those are gone, it will work normally again.