Piwik version 1.1 was released today. The new version includes a number of new features including beta support for asynchronous tracking (Google Analytics added this in December of 2009) , the ability for users to opt-out of tracking, and forced https login.
The new version includes a number of security fixes, including some rated as critical. One them is for a vulnerability we reported to them in the newly renamed Visitors in Real Time widget (previously named Live Visitors!).
The new version also fixes numerous bugs. More information is available in the release notice.