Test new modules in a sandbox before installing them using INSTALL_BASE or cpanm -L...

Test new versions of perl in a sandbox before installing them :) you can install many different portable perl distributions like strawberry/citrusperl or the .zip download of activestate (provide you edit install.bat), and most good ones won't diddle your registry to add themselves to path or setupassociations if you ask :)
More notes on building below , all perlbrew/perlall really do is save you some typing
Re: how ship perl in my application?
Re: if Digest::SHA1 loaded Can't load LibXML/LibXML.dll Invalid access to memory location
MinGW/MSYS development environment - Setting up the base system
How to install CPAN modules into ActivePerl
http://sourceforge.net/projects/perlmingw/#Citrus GCC (mingw-w64) for Perl
http://strawberryperl.com/package/kmx/64_gcctoolchain/ # (a mirror)
Installing a make utility and C compiler on 64-bit Windows
standard-msys-20111122.7z
Re: openssh build with Strawberry Perl provided gcc
Dmake configuration for building Perl with MinGW on win32.
Compiling C/C++ based Modules under ActiveState using MinGW
Re^2: Compiling modules for win32 ActivePerl
RFC: Setting up a minGW compiling envronment for Perl 5.10
The MinGW and dmake cpan starts to install
Re: Installing iodbc 0.1 via CPAN (or other means) on Mac OS 10.6
Building Math-GSL-0.07 on Win32 (MinGW compiler)
Re^3: Active Perl 5.16 email code problem"
Re: install activestate 5.10 over 5.8.9 (no, zip)
http://strawberryperl.com/release-notes/5.18.0.1-32bit.html
http://strawberryperl.com/releases.html
cpanm -L... PERLLIB ... Re: CPAN won't install into personal directory; probably an o conf problem Re: cpanm --sudo installs to /root/perl5 instead of /usr