Here’s a bit from the freshmeat announcement:
The zip task family in Ant 1.5.2 contained a couple of serious bugs that have been fixed. In addition, two regressions in the FTP and manifest tasks have been detected. This final release also contains some other minor bugfixes.
Grab it here. Also of note:
Ant 1.5.3 will be the last release that supports JDK 1.1. The next major release of Ant, Ant 1.6, will require JDK 1.2 or later.