Version 2.2.2 now released (22 May 2008).
Note:
If you are interested in being on the pulse of the SilverStripe codebase, check out our daily builds or use subversion. The following command will install a fresh copy of SilverStripe, with the PHP-based installer;
svn co http://svn.silverstripe.com/open/phpinstaller/trunk/ SilverStripeSite
You can download other modules (such as forum, blog, ecommerce, etc) at http://svn.silverstripe.com/open/modules/ . E.g.
svn co http://svn.silverstripe.com/open/modules/ecommerce/trunk/ ecommerce
We would be delighted for you to submit code patches and work your way up to being a contributor with write-access to the repository. Please email sigurd@silverstripe.com for access or to answer questions.
You can browse the code source and view bugs/requests thanks to trac at http://open.silverstripe.com/
Our open source effort will only work with volunteers contributing code, themes, examples, and documentation. Please see our contributing guide.