Release announcement from MAMP is below:
MAMP & MAMP PRO 1.9 released (with PHP 5.3)
Today we released MAMP & MAMP PRO Version 1.9 (download page). We have updated the following components:
PHP 5.2.13 & 5.3.2
XCache 1.2.2 & 1.3.0
This update is already available on our download page, don't hesitate to report any other bug you may find to our bugbase so we can fix it as quickly as possible.