G:\perls>perldoc perldelta
NAME
    perldelta - what's new for perl v5.6.x

DESCRIPTION
    This document describes differences between the 5.005 release and 
+the
    5.6.2 release.

Summary of changes between 5.6.1 and 5.6.2
    The 5.6.2 release is aimed at providing only a minimal update to p
+erl
    5.6.1, which wasn't being compatible with some of the newest compi
+lers
    (most notably gcc 3.x), libraries and operating systems that have
    appeared since 5.6.1 was released.

    Note also that perl no longer installs itself as /usr/bin/perl by
    default if it exists. (see the INSTALL file.)

    The following modules have been upgraded :

    Data::Dumper 2.121
    DB_File 1.806
    ExtUtils::MakeMaker 6.17
    File::Spec 0.86
    File::Temp 0.14
    Safe 2.10
    Test 1.24
    Test::Harness 2.30
    The following modules were added :

    Test::Builder 0.17
    Test::More 0.47
    Test::Simple 0.47
    if 0.03
[download]

FWIW, it's also the first 5.6.X that I could compile right out of the box on Mac OS X.

Liz

A longer answer.