We're wanting to release SilverStripe 2.2 next week, so why not help us and download the code and help us find bugs that need fixing before it gets released? :)
svn co http://svn.silverstripe.com/open/phpinstaller/trunk/ SilverStripeSite
And run the installer...
Add issues over open.silverstripe.com (go to 'register', then 'new ticket')