Written by Jesse Tilly and Eric M. Burke, published in 2002.  http://www.oreilly.com/catalog/anttdg/, including a nifty appendix of AntPractices.  There's also a lovely section in Chapter 3 entitled AINASL: Ant Is Not a Scripting Language, on why Ant doesn't do flow control, among other things.
--StevenNewton

2nd edition at Amazon: [ISBN:0596006098]

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CategoryAnt, CategoryBook