phpwcms has also an account at Google Code:
http://code.google.com/p/phpwcms/
There you can find the public SVN repository.
http://code.google.com/p/phpwcms/source/checkout
I recommend the following SVN clients for general users:
Windows - RapidSVN http://rapidsvn.tigris.org/
Mac - ZigVersion http://zigversion.com/
All others might be happy with Command line clients (I hate).
I use TortoiseSVN on Windows and ZigVersion (or...) on Mac.
You can browse all changes:
http://code.google.com/p/phpwcms/source/list
This is unsupported but should work.
Oliver