Strange is, that I tried even this distribution
pdt-2.0.0GA_debugger-5.2.15.v20081217-all-in-one-win32.zip, but when I
started eclipse, no Zend debuger was loaded and when I tried to install it
from http://downloads.zend.com/pdt same problem.
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)